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1978 911SC Fast Idle (when cold)

Fuel System

Vehicle Information: Model: 911 SC; Year: 1978; Body Type: Convertible; Total Mileage: 68000;

My 1978 911SC idles too fast when cold. It will idle around 2000 to 2500 RPM when started even when it is just cool outside. It seems to take 5 to 10 minutes to drop to a normal idel of 950 RPM. I have checked the power and ground circuit of the auxillary air regulator and have replaced the valve with no resulting change.Once the car is warm everything works well.

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