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If the rpms are above normal the most likely problem is a vacuum leak at the intake side of the engine. This condition will also typically cause a rough running situation at idle. Another thing that could cause a car to rev up and shake is a bad ecc(computer).

also check your motor mounts if you have an old car.

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โˆ™ 2015-07-17 17:41:01
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Q: Why would your car rev up and shake?
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