I guys I'm working on my girlfriend 00 grand Cherokee. Heres the problem when starting the jeep in the morning or when it's cold it begins by running fine and when it gets to around 150*F it starts to idle really low and want to die but does not also i start getting a strong exhaust smell and after about a min it stop idles back up and is well until next time.

she also told me that sometimes she feel like she has no power when taking off from a dead stop for a second and then it catches and runs fine

I just did a tune up and change the coil pac rail, also new TPS.

any suggestions would be nice i know this kind of problem could be lots of things.

 

Any check engine light? If so, pull stored codes for clues.

4.0 engine?

Cleaning of the throttle body and idle air control can be a helpful service to the 4.0. They get carboned up over time and miles.

 

yes sorry it's 4.0L and no codes i wish that i got a code that would be easy.