Erratic idle - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat

1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 01-31-2012, 01:30 PM   #1
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Default Erratic idle

When I start my car cold, the idle will go up to around 2500-3000 rpms for a few seconds and then down to around 700 and at times even stall. It will go up and down like this for about 1-2 minutes and then return to reg idle of about 1000 rpms.
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Old 01-31-2012, 04:04 PM   #2
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Check for a vacuum leak. You may also want to clean the throttle body and idle air control.
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