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Vacuum leak.

Could also be the idle air control valve. Read this: http://rds.Yahoo.com/_ylt=A0geu5Dx19NHdfsAi8FXNyoA;_ylu=X3oDMTE5MWc1cmxhBHNlYwNzcgRwb3MDMQRjb2xvA2FjMgR2dGlkA1FSVzJfMTE4BGwDV1Mx/SIG=12ug709tt/EXP=1205152113/**http%3a//www.tomco-inc.com/Catalog/27idle%2520air%2520control%2520motors.pdf

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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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