Theprofessional

Hello, I have a 1998 xj i6, and it has been throwing codes p0204, 5, &6, and I've tried everything, swapped injectors, new tps, checked wiring for voltage, ground, continuity, and used a noid light, all tested well except #6 noid didn't work, I also went as far as to replace the pcm, no luck, I removed the wiring harness and found multiple frayed wires making contact where the inj harness plugs into the main harness, put it through a sonic cleaner and repaired any frayed wires, and thought for sure that had to be my problem but no luck, rest of harness looked okay unless I missed something, any ideas anyone?