car hesitation around 40 mphwhat causes chills after knee replacement surgery

When the engine is first started cold it is running open loop and the O2 sensors aren't used at all. Once Im going faster or slower it stops. It may not display this or other websites correctly. A pop and hesitation is likely a backfire. Just for giggles try putting in a water-remover fuel additive to the gas tank and see if there is any difference. I have a 1996 Saturn SC2. My Nissan Macra car hestates when pressing the gas pedal, it acts like losing the power! Can you help diagnose? The throttle position sensor monitors the throttle valves position and then relays this information to the engine control unit. SOURCE: hesitation at 40mph and 50 mph. make a purchase, we may earn a small commission. Saturn Outlook we are looking at. Sign in or register to get started. Its new in box and I'm happy to pass it on for less than I paid for it (I paid $65.00). When it does it, it does it both when I'm accelerating and decelerating. It doesn't happen every day but more days yes than no. and seems to be lacking proper fuel pressure and Any offensive, obscene, or lude comments will be ineligible to win the giveaway.8. Send me a private message if you are interested. Several years ago, having a Olds Intrigue 3.8 L, that smillar jerking effect happened and around this speed, car on top gear. Jun 16, 2016. ), What Oil Should I Use? I also sense wiring problem and rewire have try to check the wire and tape where necessary, he said i should go and drive it for a while.. what should I do? There's a wealth of information to be found in what you get from it. My car used to do the same exact thing, I literally went to 5 2. If you can still snap the throttle wide open & the tach responds appropriately, it's not the cats. That rules out 2, 3, and 4 of your theory. 2014 Ford Escape with 88k miles. It happened to her again yesterday. No redline, just a steady acceleration. Jump to Latest Follow Follow remove and spray with carb spray and make the the for an ignition miss. If still having issue after that let me know. Im not sure I understand the question. Im not sure. If you have an account, sign in now to post with your account. It will definitely be cheaper to have a proper diagnosis than to fire the parts cannon at the problem. This one stayed. The car may be pulling timing for some reason when its hot. The vehicle may even stumble entirely during these seconds. fuel filters, etc. Haliuna This will cause hesitation as you accelerate. or Mass Air Flow sensor. F133S with LC-10 S-Series Large Body FUMOTO Valve with Short Nipple and LC-10 Lever Clip for 12mm-1.25. November 27, 2011 in 90 - 00 Lexus LS400, I am sharing my experience with this chronic problem of misfire at a certain speed when cruising that I see repeatedly in this forum, First I admit that this forum helped me a lot to find the cause of my problem but unfortunately after spending lot of money in changing many parts, First thing I want to say is that many issues can lead to the same symptoms of hesitation or misfire between 40 to 60 mph, Hesitation at this speed does not mean that the engine is only hesitating at this speed and THIS IS THE TRICK, The misfire is clearly felt at this speed because the torque converter clutch is engaged that means the engine and transmission are considered as 1 unit so any slight misfire in the engine will be felt in the transmission and this is happening only when cruising. owners, Over 25,000 topics, from beginner tips to technical Problem is more noticeable on hills/slops. I suspect you cleaned, as anyone would, the MAF/IAT sensors at the same time, more likely the actual "misfire" cause, as installing the O2 sensor. Car runs great between 0-40 mph and from about 50 mph on up but the car jerks while eccelerating between about 40 - 50 mph. I tried replacing the MAF and MAP sensors first. Car Hesitates When Accelerating From Stop: 11 Common Reasons In essence, delay or hesitation of the engine during acceleration happens when the engine does not get enough power, and it needs more power to accelerate from a dead stop than when maintaining the speed of a moving vehicle. What could be the cause? Zeus01 Ecu not sending signal to spark plug harness? If it's less than 2k rpm, then you have the old programming, and should get the upgrade flash to the transmission (by a different dealership if need be). Forgot to mention, older cars like yours and mine will often develop vacuum leaks within the intake system. We have a 2008 G6 with a V6 engine. Much appreciated. My car is a "beater" but now the problem has become a challenge. Only happens in the top gear around 40-45 mph. There are a lot of things that can cause this. Today, I will be better than I was Yesterday, but not as good as Tomorrow! I just purchased a code reader and as soon as but the car jerks while eccelerating between ab i have brakes when car is off but when i turn the car on brakes peddle goes to the floor what hell is wrong with it. The winner will be required to give Scotty their full name and mailing address to receive the prize.12. Camry 5th and 6th Gen '02-'11, Solara '04-'08. this issue started when I had about 97000 miles and has gotten worse. If it is just a bit of dirt or some moisture, then the best thing to . There will be one winner of a fuel pressure test kit valued at $46. If you do not agree to these terms, then do not enter the giveaway.Things used in this video:1. If it happens once, it is likely to happen again, and the car should be serviced before the transmission is damaged further by wear and tear. Could it be a thing like the TC engagement going wonky? Mechanics computer says one of my engine coils needed to change and so I changed all of them. If the MAP sensor is not working, the engine control unit wont know how much fuel to inject in order to accommodate the given engine load. Well a few more miles down the road it started again. The most honest and funniest car channel on YouTube. If the oxygen sensor is not working properly, then the proper air and fuel mixture cannot be achieved. (Kirchoff's third law), Measuring is knowing.. but only if you know what you measure. Thanks for the thoughts and suggestions. This comes and goes but happens enough that I have a service appointment scheduled for tomorrow with the dealership. As the car approaches 40 mph, the RPMs will increase in the engine. After 45 mph it stops and I have no other issues. My computer for editing / uploading: https://amzn.to/2uUZ3lo7. The first and main symptom of a bad ignition coil may be the tachometer, which drops to zero then returns to the previous speed. Standard mailing time from the win date and the date received, will depend on the winners geographic location.14. His has none.yet! If after replacing them I still have issues, I'll post back here for more possible solutions. You might need to replace your MAF sensor which is your mass airflow sensor and definitely check your fuel rail and fuel injectors. Do Not Sell or Share My Personal Information. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Robert, I have not yet found the answer. 1,520 Great Deals out of 20,946 listings starting at, Car jerks when accelerating between 40 & 50 mph. Hesitation on acceleration. By I had them replaced and the jerking stopped immediately and hasn't come back. The car has started jerking around 40-50 mph my wife said the a few weeks ago. x2 on the fuel system. carbon out of everything especially the ports 13 Answers 805 richksiny answered 7 years ago i would say fuel filter , pump as well. It happened to me a couple weeks ago. This helps the engine control unit determine the right amount of fuel to inject into the chamber. The engine then stalled. 2) O2 sensors will effect your fuel mix and could cause too rich or lean a mix that will create problems but doubtful it would be isolated to a narrow band of speed like you saw. Fuel System. loved reading your article. Car is This problem can develop at any speed, depending on which gear of the transmission is going bad. How difficult on the 3.5 V6? Why don't we agree to call the described symptom as engine "tugging" rather than "misfire" which could be misleading. I have a 1978 FJ40 which I've owned since 2007. How bad is it, and does it prevent you from driving the car normally? It makes a shooting sound (pow) many tyms. Cheap Scan Tool: https://amzn.to/2D8Tvae3. At that moment, a bad transmission can cause the car to jerk, and that could be accompanied by a loud "slamming" noise. I had the same problem and it was the gas tank. When does it happen? She kept it well maintained from what I was told. It may not display this or other websites correctly. For myself I would accept that any heater resistance up to 18 ohms would suffice. If you let your fuel injectors continue to be dirty, then it will impact how much fuel gets injected into the chamber. Your vehicle has two cooling fans, one is for the AC, the other is for the radiator. So Sunday we packed up and headed back home, and about 30 mins into the drive traveling about 45 mph the engine started sputtering. The hesitation appears around 1700-1800 rpm and last until about 2,200 rpm. I'm thinking it went to dealer. As the car approaches 40 mph, the RPMs will increase in the engine. Its new in box and I'm happy to pass it on for less than I paid for it (I paid $65.00). It does it most often when you are barely on the gas at 45 to 50 MPH and then you press the gas to accelerate. We changed spark plug, fuel filter, transmission fluid, engine oil, engine filter, and clean throttle body, change air flow sensor. you all about my successes and failures. It's driving me crazy to figure out what it could be. When was the last time the spark plugs were changed? It's frustrating to say the least! Red, Gozzard Fiberglass tub. Many times, while driving the Drive (D) indicator & Reverse (R) indicator appear on the dashboard at thesame time, after sometimes it returns normal. It doesn't happen at lower speeds. pump. Amirkade Have a mechanic trained in vehicle electronics inspect the radiator fan (https://www.yourmechanic.com/services/cooling-radiator-fan-motor-replacement) for You have two starter relays. Car hesitating while driving. I purchased my Torrent October 2014 and it had approx. Can you describe the hesitation in a bit more detail? Could this be caused from a clogged cat? An engine hesitation is an interruption of continuous power during acceleration. This obviously means we are imagining it, NOT. Not just one plug like three on pass side maybe one on other side .. now not smoking so. mechanics. Thanks to this article I will also try cleaning the MAF but It still does it with the air cleaner disconnected but it is worth a try. I basically have to push pedal 3/4 way down so that it downshifts and accelerates.. However, sometimes car jerks when accelerating is a common problem faced by several car owners. Will try and let Made with in Silicon Valley. My car has 33000 miles. When I apply throttle it hesitates and stumbles. At that moment, a bad transmission can cause the car to jerk, and that could be accompanied by a loud "slamming" noise. When this is not working properly, you may also notice a strong smell of fuel. The reason why car hesitates when accelerating uphill is simple! The radiator fan operates on a fused circuit with high amperage relays to drive them. I find the best price for oxygen sensors, and quality, the densos on amazon are pretty much literally a perfect fit just like OEM. While driving the vehicle at constant speed (from 20-40 MPH) the vehicle begins to jerk upon acceleration. Changed Fuel pump 3 times within 2 weeks 2. Hesitation Problem with 2007 LE I4. Observe where they sit both when its hot and cold outside. Join the Lexus Owners Club and be part of the Community. Car Jerks When Accelerating - Reasons & Solutions wish to see more in the coming days. It ran If you are using bad fuel which is has been sitting in your tank for too long or is too low of an octane for your engine, it can cause many different problems. WHEN CODES COME BACK IT STARTS TO HESISTATE AGAIN. If that doesnt do the trick, you may need to have them professionally cleaned or simply replaced with new fuel injectors. 4. The Fix: Replace spark plugs. Always check your fluid levels, -then check your car. Thanks for all your input. a colleague today regarding the potential 2007 Misfire is due to ignition, or lack thereof. plugs are OK. 4 inch lift, Winch, Aussie rear. What is interesting about the problem is that it only occurs as follows: driving at around about 60 miles an hour and slowly accelerating. The mass airflow sensor, also known as the MAF sensor, is connected to the air cleaner. Battery draining and charging - 2007 Jaguar XK. Indeed, over time, vibrations, the pot fasteners on the automobile chassis can come off.The most common reason for your Mitsubishi Outlander to have a clunking noise/sound coming from under your car is worn brake pads. This is how the timing of fuel injections into the chamber is made. Video editing software: http://amzn.to/2jv5Fhf8. This requires closer diagnosis. TCS light stays on for days, and then comes off for like a week, then comes back on for days again. Id visit a mechanic to get it checked out as soon as possible. Have cylinder compression checked . The winner will be chosen at random.10. Btw jeep likes NGK ZFR6F-11G spark plugs only. Best bet would be to take it to a local shop to see what they would charge you to replace the plugs. I checked the PCV and it was okay so I reinstalled it. The exhaust gas recirculation valve, or EGR valve, may be damaged and causing a leak. If Hello - from your symptom description, you have a worn out or damaged Constant Velocity joints (https://www.yourmechanic.com/article/is-it-safe-to-drive-with-a-damaged-cv-joint) on one or both front axles. The A/C works intermittently also. I have a 2015 fusion 1.5 turbocharged after getting gas, once car is killed and I go to crank it again the car goes to shuddering and losing power. Lexus # 89465-50130 / Denso OEM # 234-4630 / Denso Universal # 234-4209 / Bosch OEM # 13632 / Bosch Universal # 15733, Bank 2 Sensor 2 - Passenger side (rear) near catalytic converter. Has the problem gotten worse since the mechanic changed those parts? This helps sustain the proper air and fuel mixture while the vehicle is in use. Thats about the speed when a bad fuel pump gives up. I had suspected such for quite some time and just recently tested the theory by heating a new sensor on an electric stove element. Saturn SL with 169450 miles.. about 50 miles ago she started stuttering from front to back while in 4th gear going about 35 mph also in 5th gear going 70mph. Car hesitating while driving. year amongst other things. By It looks like you're new here. Davidson has written articles for various websites. Display as a link instead, I feel it if I accelerate quick or cruise, and feel it more when I coast. the heater is only used during initial engine start up. 4k Camera: https://amzn.to/2HkjavH4. It is really noticable when pulling out and gradually working up to around 40MPH. My car has an automatic transmission. CarGurus has 44 nationwide S-Series listings starting at $3,688. Yours is a very difficult problem to diagnose without seeing the live engine data. Had one of my U joints replaced. You could check basic things like spark plugs and wires, injector functionality, and engine air filter cleanliness. Pasted as rich text. The O2 heater resistance quoted as being required is quite a bit out of range with the actual factory shop/repair manual specification. (Heres Why You Might), Top 10 Reasons Your Car Hesitates When Accelerating or Driving, 9) Faulty Exhaust Gas Recirculation Valve. Is your question about how to test the oxygen sensor? Valvegoodluck!!!!!! If you purchased it locally and do not have the receipt, just take it back and they may have the sale on record. Hesitation and Stumbling when throttle is applied Ford F-150 2001 105693 miles Accelerator ECU Wiring Jerking/Hesitation Cannot get truck to accelerate smoothly. Is there some documentation on changing the spark plugs? Fiberglass tub. Have no idea why. I know my transmission is bad but is that all? Help? (Engine Oil Viscosity Explained), How to Debadge Your Car (In 3 Easy Steps), Should I Cover My License Plate Online? costs, Optimize fleet uptime and compliance via mobile vehicle repairs, Partner with us to simplify and scale fleet maintenance, The statements expressed above are only for informational purposes and should be independently verified. The battery has a battery temperature sensor that can fail if the Check Engine Light comes on, the battery voltage is low, or the RPM curve surges. JavaScript is disabled. Hi Everyone. A bad transmission often will kick violently when trying to change gears. Drives fine otherwise. Replacing the TPS is the only solution. Yes, it is safe to attach a battery charger to the trunk power lugs. Take the fuel line off at the carburetor, put it in a glass bottle and see how much fuel you're getting and how strong a flow. Hi all. When Low fuel pressure will cause the engine to run very leanly, and therefore it may cause the engine to sputter. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register. As others have said, lack of fuel. Hyundai Elantra 2012 MAF (Mass Air Flow) sensors I tried the MAF/MAP route but had no luck. My car was jerking as well. Thanks. Does it happen in any gear? There is a shudder under acceleration that starts at 30 mph and will continue to 40 mph were it goes away. That's also why a crack in the exhaust, even downstream of the O2 sensor element, will result in a CEL, oxygen can get to the sensor before it has time to cool. Either there will be too much air or fuel, or too little. Hesitation/Stuttering While Driving Between 40-50 MPH vicjrblue Member Posts: 1 January 2016 edited January 2016 I purchased my Torrent October 2014 and it had approx. About a 90 min drive from where I live in Virginia. Post Reply . Hesitation at around 45 to 50 MPH when you go to accelerate Hello, I started getting a hesitation/bucking in my 2001 F150 SCREW 5.4L 96,000 miles. Interestingly, such an act can help improve the lifespan of the engine. My 2007 Ford Edge hesitates/ jumps at 60-70 mph. So, when next you notice the car hesitates and jerks when accelerating, it may be due to a dirty air filter. Half cab. If your car is moving at 40 mph but is unable to accelerate any further, the transmission probably needs service or replacement. When I took ownership of it, I had the oil changed and it needed an new motor mount and front brakes to pass inspection. The dealership did mention that since it was need 100,xxx mi. 1970 FJ40 Grey, 4 inch lift, Winch, Aussie rear, ARB front. The winner will receive a reply to their originally posted comment in the video and will also be announced in a newly posted comment by Scotty around Sunday 9 am CST. When this is not working properly, you may also notice a strong smell of fuel. The car still struggles with acceleration, jerks more than it smoothly drives, shakes if I try to go too fast, brakes get hard sometimes and engine stalls forcing me to pullover and cut it off for a few mins before driving again. An engine that is hesitating to accelerate is most likely dealing with a fuel/air mixture that is too lean. Must have been his 'beater' car. A good fuel injector cleaner is often a good, cheap fix that will restore proper fuel flow from the injectors. I have a Denso 234-4167 Oxygen Sensor that I ending up not needing. Can you narrow down when it hesitates? I had not tightened a clamp enough around the filter/pump area after replacing my entire fuel system. then fill with ethanol free fuel. It doesn't happen all the time and doesn't matter what kind of incline I'm on. Prior to EFI there was no feedback loop on fuel trim (remember those things called carburetors?). 1D10CRACY 60.2K subscribers Subscribe 3.1K 583K views 5 years ago My 1999 Lincoln Town Car developed. Once this started to happen I immediately turned around and went home. What could be the problem? Flat, hill, doesn't matter. Again no improvement when driving. Also, a loose motor mount, or rear diff'l mount, might result in a tugging feel due to the resulting "in and out" action of the lockup clutch, at those speeds. No noticeable vacuum line cracks/breaks. Im not sure I understand the question. Take off exhaust manifold and clean the 2023 CarGurus, Inc., All Rights Reserved. The car hesitate when i step on the gas. If I should need to change out the metal fuel lines, does anyone know the correct size for rubber tubing to connect from the gas tank forward? Id take it back and have them double check their work. dentist tool you can get at autozone or Used to happen to me after wheeling when I would shake all the rust particles from the bottom of the tank. ;), Yes before changing the O2 sensor, The MAF/IAT sensors had been cleaned AND even changed without any improvement, One more thing I want to mention is that the O2 sensor was completely dead (no reading for any resistance), I knew that this sensor was faulty (I had a CEL) but I could not imagine that this is the reason of misfire, that's why I left it to be the last option. He is a graduate of Michigan State University and holds a Bachelor of Arts in advertising. Q: My car jerks slightly when I'm at a steady speed or trying to stay at a constant speed only around 40mph to 50 mph. This is known to cause engine hesitation problems, so it should be addressed. It goes away when I get out of that window of speed or push OD off. About a month or so ago, the car started hesitating, almost a sharp jerking, when it gets to around 40-50 MPH. When a engine is hesitating it will cause the car to lunge or surge which will cause a sudden jerk as the car slows down. When the transmission shifts, engine noise usually will quiet down, and the RPMs will drop. 2 people found this helpful. It also makes noise when the cars sitting at a light or stop sign. The only issue was that the car would shudder pr even buck a bit ONLY at speeds around 40 MPH and ONLY when the accelerator was backed off of slightly and when an attempt was made to feather the pedal and maintain a steady speed. It is usually the result of a problem with the air and fuel mixture within the combustion chamber. 11. 1978 - 1996 Big Bronco - 30-40 mph hesitation - my 93 bronc 351 e4od runs and drives great but a few months ago i noticed that between 30 to 40 mph it sort of hesitates like it doesn't know whether to shift or not does anyone know what this might be? Not if its unfamiliar to the audience or needs to be disambiguated. When trying to answer why your car hesitates when accelerating, the most common reason might be the mass airflow sensor is clogged or damaged. The car will jerk real bad when driving at a steady speed and also when slightly accelerating. One thing is for sure, you wont be able to drive safely if your engine keeps hesitating while youre on the road. But this too would be noticeable at many speeds. Ethanol vs Non-Ethanol Gas (Which is Better? If any of the vacuum hoses around your engine become damaged or worn out, you could experience air leakage from them. Over the years I have been reponsable for the care and maintenance of a '90 LS (a Bill Gate's trade-in), a '91 LS, 3 '92's and a '95. Any check engine lights? Codes won't tell me and the mechanics I've been to We're a forum community dedicated to the Pontiac G6. At exactly 40 mph. This is because something is wrong within the engine bay - what could that be? Same symptoms as you describe. The engine control unit depends on the MAP sensor to determine the engine load. also the car seems to shutter or almost feels like i am going over small bumps in the road even though its completely flat. Engine starts right up and idles smoothly. factor. We may earn a small commission from affiliate links and paid advertisements. Common issues include: Car hesitation. Just the other day it started bucking and sputtering around 40-45 mph while driving on the highway. And be aware that exposing a perfectly good, even brand new, O2 sensor to our oxygen rich atmosphere while the sensor element remains heated will/might "spoil" the sensor, cause a CEL, for the first 100-200 miles. It's like the truck shouldn't be shifting that soon. Misfires can be related to wrong plugs being used. Started September 12, 2022, Lexus Owners Club of North America The jerking happened in my car also(G6 V6 GT). Scottys Top DIY Tools:1. My 2017 Hyundai Elantra is hesitating shifting right. Sorry, I find it a bit hard to accept that a defective MAIN O2 sensor in an engine with TWO sensors, would result in a lean misfire. Affiliate Disclosure: We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites. This happen with a Pontiac 6000 , 2.8 L. hey guys, same issue here, I have a manual tranny 06 gtp. I just recently acquired the car from a friend of the family. Your previous content has been restored. Amazon Version of Fuel Pressure Tester: https://amzn.to/2pDXiDs2. In your shoes, I would delay doing the fluid replacement stuff until after doing the basics and then continue hunting the sputter/bucking problem. Only one comment per entrant is allowed and more than one comment will not increase your odds of winning.5. These are the f-body part #'s. About $65 for both solenoid and valve from Dal. would replace it for $3500 it was simply 2 $1.39 fuses. Anyways, I took the kids for a road trip down to the Outer Banks in NC. this happened on one of my previous cars, it was the spark plugs and the distributor. Battery Pack Car Jump Starter: http://amzn.to/2nrc6qRAmazon Version of Fuel Pressure Tester: https://amzn.to/2pDXiDsMechanic Monday Official Rules:1. So new spark plugs, battery, oil changes etc. I can barely discern a vibration in the vehicle, but if I have my foot just over the accelerator pedal, I can feel it vibrate in unison with the noise. This could be accompanied by a hesitation in the motor when driving. It would be best if you replace or clean the dirty air filter to stop this problem. Then you will experience engine hesitation which is most noticeable at low RPM. We were told car knocks real loud, and shifts hard to the point it jerks me back real hard. Unfortunately Im still at a loss for answers and I am darn close to rolling her down the quarry lol. when I try to stay at 40 45 mph my car chugs jerks slightly, but when I hit the gas it goes away only usually at those speeds. a sticky valve . Started February 14, By 1 Answer Engine V6 is hesitating when accelerating over 40 mph Engine hesitates and almost misses when accelerating over 40 mph. Perhaps theres a lot of sediment at the bottom of your gas tank, perhaps your fuel gauge is reading incorrectly, or perhaps you need to change the fuel pump or fuel filter. My stabilize traction control light came on but went off now check engine light is on and my car hesitates when I step on the gas and go up a hill I got a 2011 Chevy cruze. When the engine reaches operating temperature both Hello, thanks for writing in. hesitates when cruising at 40 to 60 mph. Have you checked the spark plugs? I had it flashing CEL for 10 seconds but it never stored a code (trust me, I have the stuff to find out). The 2 rear diff'l mounts are still in the freezer awaiting a nicer day. There are a range of reasons why your car is juddering when you accelerate. Bluetooth Scan Tool: http://amzn.to/2nfvmaD2. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Billy from United States 7 years ago BI Comment Same issue here 17 reports I think The vehicle has a stumble like a misfire(I think anyways) when driving. Drive it long enough that way & a CEL will appear, prob. How to fix engine hesitation during acceleration. Bill Gate's would stoop to driving an LS? If you pull the plugs, how do they look? While not optimal from an emissions perspective the cars still ran fine. It is a 350 it did over heat but head gasket good no water in oil or over heating . If there is a problem with your ignition system, such as with your spark plugs, rotor, or wires, then your engine will lose power at inconsistent times. that I should have all the fluids flushed and replaced soon. DS18 PRO-ST 1.9" Replacement Upgrade Bullet Compression Tweeters with Crossovers- Car OEM Tweeter Upgrade Kit for Many Subaru/Toyota Models - Replacement for H631SFJ101 and H631SFJ100 (Pair) $79.95. I put my fuel pump direct without a return pipe. Now it is starting to stall when stopped. When going up hills at speeds of 30-40 mph is misses. You can post now and register later. Could be a number of things. It hesitates for a second and then takes off. lol. I think one of my spark plugs/wires/coils is bad but I'm not going to spend hundreds finding out which one until I get a code. Let's Jump In! . my jeep hesitates to accelerate and other times its running great.Took it to get diagnosed and they say nothings wrong. BEST Place to SELL 1994 LS400 LEXUS with 166,000+/- miles. Entrants that do not comply with YouTubes Community Guidelines will be disqualified: https://www.youtube.com/yt/about/policies/#community-guidelines16.

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