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High Idle at Cold Start

Engine

Vehicle Information: Year: 1979; Engine (Size, Modifications): 3.3 turbo; Total Mileage: 60K;

On cold start my 79 930 has a very high idle speed, about 3000 rpm for about 30 to 60 seconds and then drops to normal. I've check the cold start reg and it's within spec. Not sure where to look next?

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