Crazy4408pac Posted June 9, 2012 Report Share Posted June 9, 2012 98 Monte. Over the past month, when the Monte is started, it idles around 1500 rpm. Letting it warm up, doesn't help. Blipping the throttle, doesn't either. Which causes the rig to run around 45-50 mph with my foot off the gas. It doesn't happen all the time. Maybe a dozen times. Any ides? Thanks Quote Link to comment Share on other sites More sharing options...
Schurkey Posted June 9, 2012 Report Share Posted June 9, 2012 Connect scan tool, find codes. Also find the commanded idle speed. First Guess: Defective Idle Air Control. Quote Link to comment Share on other sites More sharing options...
AL Posted June 11, 2012 Report Share Posted June 11, 2012 Could also be a vacuum leak Quote Link to comment Share on other sites More sharing options...
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