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Lately my car has been revving itself up and down when I 1st turn it on.

(2005 Mercedes-Benz C230)
in Van Nuys, CA on August 30, 2012
The RPM goes up and down roughly between 30-40 rpms until I start driving it This happens in the morning and goes away as soon as I begin to drive...Does something need to be replaced?
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Popular Answer
on September 12, 2012
is the check engine light on , did you pull the air cleaner off ? sounds like a vacuum leak ,i could be wrong ,
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