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1987 944S Idle speed

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Vehicle Information: Model(924/944/968): 944S; Year: 1987; Body Type: Coupe; Total Mileage: 205,000;

I have a question on the idle speed on a 1987 944S. I know that it is not adjustible like the normally aspirated 944, with an adjustment screw.This vehicle had a complete valve job 4 months ago. The idle speed when warmed up is 1200/1400 RPM's. I know that the factory manual indicates that it should be 840 RPM's. What factors and sensors affect the idle speed? And can a home mechanic do some trial and error fixing to zero in on the idle speed? The car has working A/C, and cruise control. The car does consume oil, I have not kept an accurate record of how much.

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