Trying to bring my jeep back to life. I keep getting misfire code P0302 and code P0202. My jeep runs very well on the highway, no overheating, and good oil pressure but as soon as I come to a stop, it idles very rough and sometimes stalls. What should I try first, fuel injector, spark plugs, iac?

Please help me get my jeep out of the garage and back in the mountains!

 

Well then give it some love baby, get a fresh tune up, all filters, plugs, coil pack if you have 00-01. Clean IAC + TB.

 

Thanks for your post.

We’re here to help, but you must understand that all Jeeps are not the same.
In order for us to give you more accurate advice and help, we must know the following, as applicable, along with detailed information as to the symptoms/problems etc:

Year
Model
Engine
Transmission
Transfer case

 

Okay here is some more information:

2000 Sport
L6 4.0l
Automatic
Np 231

Thanks!

 

Mo betta.

When is the last time it got spark plugs?

Ever cleaned the throttle body and IAC?

 

This Jeep is brand new to new so not 100% sure on the history of the spark plugs, but probably need to be replaced. I just yesterday cleaned the iac and plan to do the same for the throttle body today. It has trouble starting on the first try but almost always starts on the the second or third try.

 

I did plugs, cleaned the throttle body and iac, cleaned out the coil pack boots (2000) and it made a world of difference with rough idle.

 

Good plan.

Be sure to grease every fitting on it and check lube levels and condition while you're at it.

Previous owners cannot be trusted.

 

Thanks for all the great tips, I cleaned the TB, iac and changed the spark plugs and unfortunately nothing has changed. It actually wouldn't even start today. Does anyone know of an easy way to test the coils?

 

It might be the cps if it didn't start.