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You did't provide the year/make/model/engine, but...The throttle cable/ throttle spring can be faulty/sticking. Another possibility is there is an air leak, after the throttle blades that is allowing the engine rpms to be high at idle. You can check vacuum line to the intake manifold for damage or the AIC (air idle control valve) for being stuck open.

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Q: Why is my car accelerating by itself?
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Related questions

Is my fuel pump going when there is gasoline leaked under the car and the car sputters while accelerating?

A gas leak with the car sputtering while accelerating could be a hole in the vacuum hose that controls the flow of gasoline out of the tank. This type of leak is usually not caused by the fuel pump itself.


Noice coming from car when accelerating?

noise and jolting is present whilst car is idolling and accelerating


What measurements or observations tell that a car is accelerating?

Frame of reference is the measurement or observation that tells you that a car is accelerating. It uses the second law of motion to tell you rather or not the car is accelerating.


What measurements or observations tell you that a car is accelerating?

Frame of reference is the measurement or observation that tells you that a car is accelerating. It uses the second law of motion to tell you rather or not the car is accelerating.


Why is my car weak on accelerating?

your car might be weak on accelerating because it isn't firing on all cylinders.


A car accelerates from to at a rate of How far does it travel while accelerating?

A car accelerates from to at a rate of How far does it travel while accelerating


What does not involve a car accelerating?

braking


Why does a car jerk when accelerating?

Something to do with the transmission. Probably slipping It's the force of momentum being exerted on the car, the chassis of the car doesn't quite "catch up" with the engine itself without a transfer of momentum, or "jerk".


Use accelerating in a sentence?

My car is accelerating at 10 miles per hour per hour.


How can you tell if an object is accelerating?

You know that a car is accelerating because you will be pulled in a direction opposite the force that is accelerating the car. This is Newton's Third Law: "For every force, there is an equal and opposite force".


What sounds like a airplane?

a car accelerating.


Why does my car make a whirring sound when accelerating?

There are a number of reasons why your car may be making a whirring sound when accelerating. You may have a lose part for example.