Have a 2001 XJ has a coil pack recently the last 2-3 weeks with the temp in the 70s i have a really rough idle if i drive for more than 15 mins. Then Turn the jeep off after 5 mins of being off no less. Cranks starts everytime runs rough rev the jeep twice and goes away.
Anyone have any ideas on what it is?

Throws no codes

 

Any other symptoms? any error codes or check engine light?

Sounds like it could be vapor lock on the fuel rail/injectors. The gaps in the intake let heat from the exhaust come through and basically bake the fuel rail, the fuel gets hot and doesn't flow right and causes misfiring (runs rough). You have an 01, so it probably has the 2 precats right below the intake, making things even hotter. This happens alot in warmer climates too. They sell a heat shield that fixes the problem.

http://www.tascaparts.com/oe-mopar/cbxcb060

 

No other symptoms just chopping until reved up twice
And i already have that heat shield on came on my jeep still very intacted

 

Sounds like an injector leak

 

Could also be that heat soak issue on injector number 3 that there is tsb for...

 

had that already injector is still wrapped up. It wasnt choppy last time. Sounds almost like all the cylinders are misfiring

 

Could be one of the coil packs is failing. Inline spark tester will tell you if you are getting anything.

First thing would be to get a scanner and check for any misfire codes

 

Ask a mechanic buddy he told me could be dirty throttle body. So i went and cleaned mine so far it hasnt been doing it my was completely black with a 1/4" of build up. I used a mass air flow sensor cleaner from autozone