When the problem happens, can you pull over and figure out which cylinder is not firing, maybe by using and IR gun type thermometer aimed at the exhaust head pipes? Or run long enough for one pipe to cool, and then spit on a finger and see which pipe doesn't go "pssss" maybe.
If you know which cylinder is having the trouble, at least you'll reduce the possible sources. Also, you'll be able swap components and know when you've found the culprit, since the cold exhaust pipe will move.
Welcome to the board, Brian!
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