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Vacuum leak.

Could also be the idle air control valve. Read this:;_ylu=X3oDMTE5MWc1cmxhBHNlYwNzcgRwb3MDMQRjb2xvA2FjMgR2dGlkA1FSVzJfMTE4BGwDV1Mx/SIG=12ug709tt/EXP=1205152113/**http%3a//

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โˆ™ 2008-03-09 12:35:22
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Q: What is a most common cause for rough idle?
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There are several things that can cause your 2004 Chevrolet Trailblazer to idle rough. The most common causes are a dirty fuel filter or a dirty air filter.

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