I've got an interesting issue with my 97 TJ. about 99% of the time when I start it up in the morning it will rev up to about 1800 RPM and then try to stall. If I don't do anything it will rev back up and go back and forth between idle and trying to stall. It will actually stall every once in a while.
I can back out of the driveway, but as soon as I get on the gas, it has no power and it takes quite a bit of skill to give it enough gas to get it moving while also fiddling with the clutch pedal. After 10 seconds or so its perfect the rest of the day.
I am thinking that its the coolant temp sensor but I really don't have much to back that up with. Any other suggestions?
Oh, I put a 4.0 TB on there about 6 months ago. It was hesitating before I did the swap and it is still doing it after replacing the TB. I cleaned all the passages and sensors on the TB when I had it off.