I have a 1985 firebird V6 2.8l. Lately the car has had a high idle problem. The tach will jump as hgh as 15-25.Sometimes it will idle down to the
7500rpm it's supposed to idle at. After the car is driven and the vehicle is put in "park" the rpms jump to 25, but if you shut down the engine and restart, it's OK. Starts OK on park only when the transmission is put in park while the engine is running will the rpms jump. Any ideas on the high idle? TPS, O2??? thanx for any info.....JeffVB- posted
20 years ago