69 25 hp johnson acts like only running on 1 cylinder

Changed plugs wires points condensors pretty much everything to do with electrical on motor ran great for about an hour then missed a couple of times & acted like it was only running on 1 cylinder lost a lot of power it done this in the past that's when I changed everything & thought I had it figured out it ran the best it ever has for that first hour then dropped a cylinder any help would b greatly appreciated don't know what else 2 do.

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