I would start by asking when was the last tune up. If its been awhile then maybe its time. As far as what could be wrong there could be a dozen different things wrong. For example: vacuum leak, incorrect timing, fautly distributor rotor or cap, bad valves, clogged air filter, faulty EGR valve among one of them and ETC ETC ETC ETC. If you have some knowledge and equipment you can run some test to eleminate possibly causes. If you need more help just ask. BYM[/quote:f2293b47a5]
I have a similar problem. When I'm stopped at a light or stop sign, the idle is normal, but then it races. It does this intermittently, but only while I'm at a stop. My last tuneup was in July of this year. When I turn off the motor, a hissing noise emits from the engine. :
Sunday, December 17th, 2006 AT 2:19 PM