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Old 04-28-1999, 09:37 PM
Posts: n/a
I have a 1985 500SEL that did somewhat of the same thing. Two things cleared it up:

1: Regapped the spark plugs- whoever did the presale tuneup just took them out of the box and stuck them in the car. Hmm.

2: Replaced a cracked vacum line. That really helped!

Mine was more a "knock" every 20 or 30 seconds when idling, and poor performance at speed.

Good luck!


[This message has been edited by jmann (edited 04-28-99).]