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Good afternoon and welcome to JustAnswer!!
What is the compression for all cylinders? Also what is the fuel psi and when did this start?
Can you check the compression so we can make sure the base engine is ok.. Also if you erase all the codes and start it do all the codes come back active?
If the misfires codes clear and it's an intermittent issue then it sounds like carbon on the valves.. Can you decarbon the valves following the PDF I attached to see if it resolves your issues? Because it sounds like your base engine is ok and if it were a spark plug or injector then it would misfire all the time..
I hope this helps,
What are you referring to a #39? It basically says to spray decarbon into the breather and allow it to soak 2-3 hrs and then drive it in low to keep the RPM"S up to flush out all the additive and see if your issues are still present..
I see this question is still open.. If you need more assistance feel free to reply, and if not then don't forget to rate so I'm compensated for my time..
Have a greatday,
If you need more assistance feel free to reply and if your all set I would greatly appreciate a positive rating so I'm compensated for my time..
Have a great weekend,