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Old 07-02-1999, 11:36 AM
MB STARS MB STARS is offline
Senior Member
Join Date: Apr 1999
Location: Walnut,CA,USA
Posts: 554
Have you check your engine mounts... and also
1988 modle 420 SEL idle ca be raised 50 RPM
when transmission in gear ask a experince MB tech should know how to do it.

MB STARS Master Guild Technician,12 years MB tech
5 years independent shop owner