I have a nice 800rpm idle when the car first starts up. After some driving, the car will sometimes just idle up to ~2000rpm at stop lights. It's not surge, it's a steady idle. Any ideas on why it's doing this? It's a 1992 gsx 5spd btw.
mine was doin this too. i ended up replacing the isc and adjusted the bov. and it went away. i dunno, it helped for a while but now i need a head gasket, and it does it after it gets hot. Don't know if this helped at all but good luck
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