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Old 02-26-2005, 10:48 AM
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Join Date: Jun 2002
Posts: 30
Idle speed

My s280 w140 idles at 750 rpm when in park or neutral. This is fine, but when i engage drive the revs drop to 500 which causes problems. When i stop on a hill the car does not stay still but starts to roll backwards and i have to feather the throttle. I have been told that it is the vacum modulator on the gearbox, can anyone give me some advice as to what might be causing the problem.
Many thanks
Lester.
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