rough idle

Hey Everyone, I've been lurking/learning from y'all for a bit now, but hoping I might get some more targeted help in case there's an 'if A and B, then for sure C' that I'm missing. Bought my TJ just over a year ago (with a fair few 1 beer problems with it), but what keeps plaguing me is a...

I've been trying to help my buddy fix an issue that's happening with his 2005 TJ 4.0 straight 6 with automatic transmission and around 130k miles. The issue he has been having is it idles rough when cold and will shut off if you don't feather the gas. Once it's warmed up it idles fine. However...

I have a 2005 Wrangler LJ with the 4.0. I have been getting a CEL for P0300, P0303, P0304 and P0431 randomly. Each time I reset the codes they randomly come back. I wasn't really worried because it was running fine. It started to have a slightly irregular idle so I replaced the spark plugs with...

My problem started with 5 o2 sensor heater circuit codes. Then the ac stopped working. Then it started shifting hard out of 2nd. Now it’s running like injectors aren’t working. Obd2 port just stopped working. I have checked all the grounds I can find even tried running a thick wire from the...

Hello TJ Forum, I have been trouble shooting my 01 TJ with 59k miles for the last year or so and cannot seem to find the cause of its issues. The Jeep has an idle around 500rpm and once put into gear there is an immediate difference in the vibration at stand still; the vibration goes away once...

Lengthy but wanted to be detailed I have 1999 2.5 Tj 5 speed.. it’s been giving me issues lately such as Sputter when accelerating rough idle Randomly cuts off (that just started) My bf and I originally thought the fuel pump was going bad since its more than likely had the original fuel...

Hi all, firstly apologies as I've posted about this issue a couple times and in different places but im still having issues and in need of some advice, and am hoping that by posting again it might gain a few new eyes and some new interest. I recently picked up an 04 TJ 4L with the 42rle auto...

My 02 TJ has been idling very poorly recently, I have a new throttle body (different thing), new TPS, and just recently cleaned my IAC with throttle cleaner and it did not help. My spark plugs all look fine and the jeep runs fantastic when it's driving and when it's up to speed it just idles...

Thanks for taking the time to read my post. I tried to cover everything—but let me know if I missed something important. I have a 2006 Rubicon TJ 4.0 i6 w/automatic transmission (120k-ish miles) with a rough idle. More info: • I believe it only happens when it's up to normal running temp...

Howdy been diving through the forum and was looking for some advice. Just bought a TJ In a great shape it spent its whole 115,000 mile life in a Arizona Garage and is in amazing shape. Cars been well maintained mechanically and I have every service record for it. I drove the car back to Colorado...

So its happened a few times and it always happens when i have to turn the Jeep on and off several times like running errands or something like that where I'm starting it up more then a couple of times. So the 4th or 5th time I start it up the engine starts to sputter and run really rough for a...

This just started happening a few days ago. The Jeep is running great, idles smooth, no problems. I shut it off, go run in a store, come out around 5 or 10 mins later, fire it up and it idles like crap. I goose it a little and it sounds like crap, almost like it's running on five cylinders. Then...

My first TJ is breaking me in, nicely. It's hard to start, pretty sure that is the fuel pump (Check valve). What is stumping me: When it does start, from cold. It sounds like it's running on 4 cylinders (Its a 4.0) Pop the throttle and idle it up and it smooths right out. In...