Hi,
I have a 1989 camaro rs 305 TBI 5 speed. When the engine reaches operating temp the idle fluctuates from about 600 to 1000rpm. Also, after it's warm when I take off from a stand still the car hesitates. When cold and running down the street it runs fine. I have replaced the O2, IAC, and knock sensor, cap, rotor, and wires. Any ideas??

Thank you,
Bill

 

check the idle air bleed(AIB) and the EGR circuit

 

thanks for the advice. I bypassed the EGR and plugged the vacuum line. The car ran good no problems even after warm. I checked the EGR valve with a vacuum pump and it seems to be working fine. Is there a problem running the car with the EGR disabled? Is something wrong with the EGR even though it check out ok with the vacuum pump? Or is there anything else to look into?


Thanks,
Bill