2000 GMC Sierra Repair Question
Why is my GMC Sierra idling high when I come to a stop?
Have you checked for codes yet?
Well it's not throwing any codes at all.
Lets try this remove the negative battery cable for one min then hook it back up.See if that works sometimes all you have to do is give the computer a little reboot like when your cell phone acts up and you turn it off and on again.Let me know what happens.
Ok so I tried that and nothin changed... Now I was thinking, I did clean the throttle body and replaced the gasket, could a vacuum leak from the new gasket not sealing properly possible cause it to act that way?
The only reason I wasn't thinking a vacuum leak was because it idles down after a few seconds. It wouldn't hurt to look for a vacuum leak.Also.how is the coolant temp sensor?
I changed that about 6 months ago and alright I'll check and get back with you
Alright keep me posted.
So I have been driving the truck and it still does it but I notice it only does it with the ac on.
Does the idle kick up when turning on the ac?
When the truck is sitting still at idle and I turn on the ac it fluctuates every so often like every 45 seconds it's will rev a up from like 600 rpms to about 700 to 750 and drop back to 550-600