fjdiesel wrote:
I too am interested on what you find out was the culprit.
I'm not hearing anything regarding my problem. I did however search the internet and found an instance where leaking vacuum lines were suspect. This made me think of my last vehicle, a 2000 Jetta TDI (diesel). I had a problem where it would often go into limp mode. The problem turned out to be leaking vacuum lines. I replaced them and it solved the problem. The difference is, the Jetta ran well while in limp mode, just had low power. The Jeep ran like crap. Maybe their limp mode isn't quite as refined.
I had also noticed recently that shortly after starting the Jeep, I would hear a thump coming from the dash area. It made me think, a leaking fitting could be loosing vacuum while sitting. Then, when I start the engine, vacuum is restored, causing some vacuum controlled flap in the AC system to close with a thump. It seemed to make sense.
Yesterday I looked over the vacuum lines. I didn't see any cracked lines, but did find a couple places where connections seemed loose. I replaced those lines and will hope for the best. If I have any more information, I will post it here.