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1991 944S2 High idle speed

Engine

Vehicle Information: Model(924/944/968): 944S2; Year: 1991; Body Type: Coupe; Total Mileage: 23,000;

Idle speed tends to run from 1000 to 1300 rpm. It doesn't hunt or fluctuate but stays at whatever idle speed it drops to when the car stops or is started. The engine runs and idles smoothly otherwise. No error codes come up on the built in diagnostic. It reads out 1500. If there is a vacuum leak I can't find it.

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