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Idle issue.

Engine

Model: 944 turbo, Year:1986, Mileage:52,000, Type of use:Street use only
On a cold start up, the car runs flawlessly, for hours at a time. On retsart, when the engine is still warm or hot, it still runs great, but the idle will not come down to normal position. It runs at about 100 to 150 RPM above normal idle, making decelerations a bit jerky. Eventually, after about 20 to 30 minutes of driving, it returns to normal. Any thoughts? This car is in excellent condition, inside and out and well maintained.

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