1991 Chevrolet Silverado 2500 "high idle 454" Questions

high idle prob fixxed on my 91 gmc sierra k2500 454? i dont need need the high idle at all Typically high idle occurs when vehicle is started when cold. The idle will go down when the vehicle warms up

high idle speed my 454 ci has ele ignition and has a high idle. Is it adjustable? how do i fix it? replace idel possition sensor

...454 MAKES LOUD EXPLOSIONS WHEN IDLING AND SOME TIMES WHEN ITS RUNNING I HAVE REPLACED THE CARBURATOR ADJUSTED THE TIMING AND DID A COMPLETE TUNE UP AND FILLED THE TANK WITH FRESH HIGH OCTANE GAS GAS ...

...high. Just bought this used, don't know much about the truck. It may be a worn throttle shaft. Had a similar issue with my 305 TBI. Replaced the throttle body with another used unit - problem gone. ...

replaced injectors in 2000 3/4 454 put back together and start truck goes right to high idle what we do wrong throttle body the idle air control motor may be unplugged or the throttle cables stretched

...high and I was wondering if it could be the map sensor? Orther than that the truck runs excellent. Or could I adjust the idle by turning the distributor. MAP SENSOR, TPS,PCV VALVE. Start with the pcv ...

...time to time but has high idle most of the time. Make is hard to drive and because it fluxuates i neaver know how fast i will stop when i downshift. oh 3 speed on the granny. Look for a vacuum

high idle I have a 454 in my truck and it idles around 1000 is that normal? Your truck should have throttle body injection. Most of the electronic issues that will cause a high idle will turn on your ...

...idle but smooths out at higher rpms now its not runing good at high like its not getting fuel i changed filter and did a tune up Assuming the check engine light is not on, I would check for vac leaks ...

...high I have a 90 454SS chevy truck. The truck idles about 750-850 rpm`s in drive. I changed the Idle Air Control and it didn`t seem to help. When you crank it after it is good and warm, it starts ...