[W126 Coupe] rolling vibration at idle on 1985 500

[btb management]

My 1985 500 SEC had a slight shake like it was missing at idle....thought it was a spark plug but
they checked out ok.  My mechanic looked at it (he claims for 8 hours) and replaced the
ignition distributor cap but that didn't solve the problem.  Drove the car and the initial
shake is gone but now there is a rolling vibration when the car is standing still.
Any thoughts?

Thanks,
Bob
 		 	   		  
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