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1977 turbo, engine rpm bounces


Vehicle Information: Year: 1977; Engine (Size, Modifications): stock; Total Mileage: 27000;

The rpm on my car bounces when I let of the gas, like when you come to a stop sign. The rpm will bounce from as low as 200 to around 1500. It will bounce 3-4 times and then level off. I usually does this more when the engine has warmed up. Any thoughts?

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