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It sounds like you have most items covered. I assume that the cams were changed long ago, but if a cam started to rotate on the gear it could cause low power and vibrations at certain RPM due to reversion of charge. I would also make sure that the foil shield on the crank sensor wire is intact and grounded on one side. A stray signal generated by electrical interference can cause the CKP signal to be corrupted which would cause the PCM to try to make the right decision based on bad information.