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There are 2 issues that need to be looked at in this case. Procure a can of CRC MAF cleaner from a FLAPS. Follow the directions and clean the MAF sensor. The GM sensors get dirty and that confuses the computer. Second clean the Idle air controller with carburettor (Berkebile 2+2 or equivalent) cleaner. Also clean the manifold passages where the IAC lives. If this doesn't fix the issue replace the IAC unit. (NAPA part about $60).

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Q: 3100 motor and the idle speed goes up occassionally?
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