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For what it is worth, I had a miss on #5 (heat gun on exh manifold) and changed injector without change. Found the problem in the ECM connector, a tiny bit of corrosion. Cleaned both mating surfaces (pins and sockets) and no problems for several years now..
your issue could easily be the same.., it’s worth a try if you have not found the problem yet.
Gordon …Marathon build 564