Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
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Have you had the vehicle scanned for fault codes and also does it feel like a misfire while driving or more like a vibration at idle and low speeds or when putting the vehicle in drive or reverse?
Remove the air intake where it meets the throttle body and clean out the area where the butterfly is. There is likely carbon build up in there. These are notorious for two things. Oxygen sensors causing stalls and lean conditions while setting no fault codes and your vibration is almost definately going to be caused by motor mounts. The oxygen sensor is not used during the initial warm up but after several moments. That is when the vehicle goes into closed loop mode and adjusts the fuel mixture based on the o2 sensor. If this reading is slewed, it will cause a lean or rich condition. The mounts are hydraulic and sag over time. When the mounts are removed you will likely find them 1/2 to 3/4 inch shorter than the new ones. This will cause a vibration at idle sometimes so bad it feels like it could shake a filling loose. ;)
OK, Let me know...Clean the throttle body initially. Of course reading scan date would be extremely helpful however I'm betting the vibration is the motor mounts and the stumble is either the carbon in the throttle body or a slewed o2 sensor.
Hi Bill, will accept your answer. Just cracked my ribs at the cottage a couple of days and will not be able to bend over the fender to get at my Throttle body......
Thanks for your professionalism.......Jazz
tHIS SHOULD BE CLOSED. The computer had to be reset and downloaded . worked fine after that.
should close this out.....Thanks again.....