91 Jetta crazy idle...please help!

This has happened twice in 3 days. I start my 91 Jetta, 1.8v, 5 spd, and my idle shoots up to 4000 rpm and stays there unless I start driving, press the gas pedal, and it goes away until I stop accelerating and it revs back up to 4000 rpm. Even if I'm stopped, in 1st, 2nd, neutral, it doesn't matter. My car has 170, 000 miles on it. The clutch may need to be replaced, though my brother, a well informed car kinda guy, tells me my clutch is in good shape. Anyways, so after about 8 times starting the engine, my idle eventuaLLY

i had a simular problem like your having my 91 golf was automatic so i ssumed it had somethign to do with that,, im pretty sure its either a vaccuum leak or your idle stabilizer valve. you may need to replace this or clean it, this may not be the problem at all but i put a different one on and it seemed to stop.. hope this helps some what


markethan