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Q: Car idling roughly and loudly

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My car idles roughly and loudly. It also does not accelerate fast when I push the gas pedal.

Hello. It sounds as though you have a misfire present, and the engine is not running on all four cylinders. The lack of power would also be related to this. There are many causes for a misfire: a failure in the ignition system, a failed fuel injector, or an internal engine problem. The most likely failure would be in the ignition system. I recommend getting the aid of an experienced mechanic to properly diagnose your rough idle condition, since the ignition system uses high voltage that can shock a person.

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