2.5L Problems, help!

[lugnut8]

So heres the story... I own a 1994 YJ 2.5L manual. Recently the engine had started to sputter quite a bit. Did an oil change and she seemed to be runing fine. This morning on the way to work, about a 30 min drive the engine died at a light. I start her back up and she revs to 2000rpm and stays at that speed. (usually it will start up with a quick rev and settle down) light turns green, put it into first and start to go. Al of a sudden the revs drop to 0 and the engine light flickers on, then it jumps back up to 2000rpm again, doing this in like 1 second intervals so the jeep is constantly jumping back and fourth. So i pull over and shut her down, leave it for 5 min come back starts up fine and make it back to work with no problems. After work, On my way home it does teh exact same thing, I have no clue what it could be, I figure it must be some electrical problem since the revs are so constant. Some help would be awesome!
 :evil:  :evil:

[BlackYJ]

When was the last time you did a tune-up?  I would start there, cap, rotor, wires, and plugs

[hps4evr]

tune ups always help... but something is telling your idle air control(IAC) to bump up the idle. the throttle poistion sensor(TPS) can go funky and do this sort of thing. especially out of the blue. and then let it sit and it will be fine. im not saying thats what it is. but get the engine scanned at a certified shop and they can tell you what the history codes were. one of the first steps in diagnosing such a problem. keep us posted on what went wrong.

[jeeppilot]

Had similar problems... TPS was the culprit.  Little bastrds aren't cheap either... 55 bucks or or so.  But...

[rws]

The cheap thing to do first is clean the throttle body.