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Old 12-15-2002, 01:19 AM
nthach nthach is offline
Newbie Benz Driver
Join Date: Dec 2002
Location: Between Oakland and Vallejo, CA
Posts: 253
It sounds like a vacuum leak, my parent's 420SEL(I work on it) had the same problem, but there was a little U-shaped hose with a check valve on one end attached to the intake plenum that was disconnected, and the rough idle went away, but after the injector nozzle seals were changed, and oddly enough the water pump(a mechanic did all that) was replaced, the car just purrs like a kitten now.
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