I was gonna ask how you know it isn't running on that cylinder... no heat on the header from there, or does the engine not change idle when you disconnect the plug lead to it ??? Only thing missing on your list I think would be checking the plug leads good and in the right order, but I'm sure you've done that already.
Bit of a stretch, maybe an exhaust blockage so on the intake stroke it doesn't actually draw any mixture in ???
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