[Jack E/NJ]

Craig>>>Again, the engine worked perfect . . . for a very short time before starting to misfire again. >>> problem stayed with the cylinder, not the wire.>>>>What else could that pattern suggest?>>>


Nothing --- based on all you've tried and observed so far. Always same cylinders. So tend to agree with Mart. Something other than ignition. Might be sticky valve stems after getting warmed up. Since it's easy, maybe try running some MMO in the carb & tank for a while to see what happens.