Trigger Point misfire
I had the same symptoms on my 280 SEL 4.5. Due to a bad distributor shaft seal ( not 0-ring ) oil entered the trigger point assembly and fouled the contacts. The distributor was rebuilt although it can be expensive,and I replaced the trigger unit and now the car runs like a clock.
Try getting a used or junkyard unit, you might get lucky. Also check for shaft wear and play.
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