Q: Revving noise in engine.

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When starting my vehicle, it makes an accelerating and decelerating revving noise continuously and when the car is warm enough, the noise stops. If I bring the vehicle to a full stop, the noise then continues once more. It also doesn't mark gas properly. as I accelerate the gas gauge moves up and the same happens with deceleration. This has been going on for about 2 weeks.

My car has 80060 miles.
My car has an automatic transmission.

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