Thought I had bad gas, never did it before just in morning on cold thirty degree nights, morning start ups, engine would start, high idle at 1000 rpm, then idle down to 700 or 600. After about a minute or so it will idle rough, sometimes idle down to 300 to 400 rpm, sometimes activating check engine light to flash but not stay on steady. After five minute warm up, it will clear up, runs and accelerates great, after sitting all day, a start up in the late afternoon sometimes but not all the time will do the same rough start up. Have put new vacuum solenoid on and cleaned inside throttle body with cleaner still have problem. Been working on Chevrolet's for thirty five years having problem with this one. Hope I will not have to go to $100.00 per hour GM shop! Could it be throttle sensor or other sensor on throttle body? Jack Ski
have the same problem?
Wednesday, January 30th, 2008 AT 7:05 PM