Thank you all for replying. A learning experience for this novice shade-tree mechanic... Took the cap and rotor off. Inspection "looked" ok, but decided to replace anyway. HT lines only 6 years old. EZL signal was good. kV's coming from the coil are good. So...new cap, rotor, and plugs later, runs smooth as can be.
Again, thanks to all!

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1987 300e W124 M103 My baby.