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Engine Idle

Fuel System

Vehicle Information: Model: 911; Year: 1987; Body Type: Targa; Engine (type, size, modifications): 3.2 liter; Total Mileage: 32500;

I recently replaced the small idle microswitch on the throttle body to correct an idle problem. Replacing the microswitch mostly solved the high idle, and the COLD ENGINE idle speed is spec at 880 rpm. However, as the engine warms up, the idle speed seems to moves up to about 1050 max rpm. Not sure why it creeps up, but it seems to have to do with increasing engine temperature. Any suggestions on how to remedy this situation?

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