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Fluctuating RPM while on the gas

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Old 05-20-2012, 11:57 PM
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2008 C300
Cool Fluctuating RPM while on the gas

Hey guys
I have a slight problem, my RPM is going up and down maybe 100 up and down while I am on the gas. Does that mean I have a vacuum leak?
I changed my air filter and exhaust recently, is there anyway to check?
Thank you!
Old 05-21-2012, 12:18 AM
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2008 W204 Sport
You should take the air filter back out and make sure it is properly seated in the air box and that the air box is properly seated
Old 05-21-2012, 12:45 AM
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I just lookd at it. There is one corner that does not sit flush but it's like that for both sides..is that normal then?
Old 05-21-2012, 01:03 AM
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It should sit flush, filter, and air box should all be seated properly
Old 05-21-2012, 01:35 AM
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can a leaking exhaust lead to this as well?
Old 05-21-2012, 01:41 AM
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No, if you have your old filters, slave them in real quick and see what happens

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