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high idle when cold

Engine

Vehicle Information: Year: 1981; Body Type: Coupe;

recently the morning temp has dropped down to 30 degrees f or less,the car is garaged,however the idle goes up to around 1800 rpms for at least 10 to 15 miles of driving then comes down to 900rpm,its never done this until the cold weather,its not a everyday driver,butI do occasionally drive her to work.what are your thoughts?

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