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New or original coils?
As a test, close the plug gap down to .010 to .015 and see if low speed run quality improves. Also try to determine which cylinder is dropping out. If the run quality doesn’t get better and the problem cylinder is #2, then maybe you have a crank seal problem. If it does get better, you may have an ignition problem and/or a weak magnetic rotor.
I forget which motor it was, as it was a long time ago; but I had a Bendix Merc that did the same thing. It had all new everything. I ran the plugs at .010 and it ran fine. Not saying it’s right; but sometimes with Bendix there is just no winning. I always thought it was the rotor but never proved it.
Long live American manufacturing!