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A bad spark plug, a bad spark plug wire, a bad distributor cap, a bad rotor, a bad fuel injector, the firing order is mixed up, a bad valve or a vacuum leak could cause your rough idle.

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โˆ™ 2010-02-19 21:12:59
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โˆ™ 2006-04-23 16:37:56

Vacuum leak is the most common cause.

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Q: What is cause of rough engine idle?
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