Start Up Idle Question - Chevy Cobalt Forum / Cobalt Reviews / Cobalt SS / Cobalt Parts
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post #1 of 1 (permalink) Old 04-02-2010, 09:05 PM Thread Starter
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Join Date: Mar 2010
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Start Up Idle Question

When my car has been sitting for more than four or five hours and I start it up, the rpm spikes up and down from about 500 up to 1200 over and over for a minute then idles normally. Has any one else experienced this? It just recently started doing it and my last car did that when the PCM needed replaced
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