Cleaning up the bad spark plug clears the problem, but seemingly short lived and quickly starts to misfire again. As metnioned, no issue with compression or any other cylinders. So it cant be valve related / piston ring or head gasket. It cant be coil, rotor arm or condenser otherwise would affect all.
That leaves Distributor Cap, HT lead or the Plug itself.
Have swapped the plug around to start with as that is the easiest. When she starts running rough again, then recheck. If the problem has moved with the plug - replace it.
If problem remains in the same cylinder then look more closely at the HT lead and the Cap.
Will get there in the end!! Still have this damn electronic ignition set up that I guess I should fit... Hummmmm...
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