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Q:

Slightly rough idling and grinding sound when engage alarm. on 1999 Mercedes-Benz C280

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I experience a slight rough idling after starting the car and sometimes at a light. I just bought it from a repo dealer. it has 126,000 miles.

I also hear a grinding sound when I engage the alarm. Sounds like it coming from the side of the trunk.

Lastly, the rear passenger window on the drivers side does not roll down. Any help will be appreciated. Also looking for a great mechanic in the Van Nuys, CA area.

Thanks.
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