• Have the EGR valve checked. A failing egr would act like a big vaccuum leak at idle, but would pull closed at higher rpm. If your bowtie is fuel injected, you might also look into the throttle position sensor.
  • Thanks for your reply, but all of the things you mentioned have been replaced along with the computer. This probleb has stumped the GM dealership and the best independent mechanic in town. Thanks again!

Copyright 2023, Wired Ivy, LLC

Answerbag | Terms of Service | Privacy Policy