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Rough idle when in gear, otherwise smooth sailing....
OK...so I've narrowed the symptoms down some more on my 98 CLK 320. When I'm at idle in park or neutral my RPM is about 700-800. If I put it in gear (R,D,3,2,1) it drops close to 500-600 and I get a slight vibration along with this humming noise. If I turn the A/C on it gets a lot worse. Any ideas? I have about 90k. I recently relocated to So. Cal so I don't have my indy back in Miami anymore....any help would be appreciated.
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