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1991 944 S2 Engine idle fluctuation


Vehicle Information: Model(924/944/968): 944 S2; Year: 1991; Body Type: Coupe; Total Mileage: 105K;

The engine speed has begun to fluctuate between 200 and 850 RPM at stop after running at highway speed or at the end of a DE session. What is/are the potential cause(s) and how do I check the potential cause(s) to diagnose the problem?

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