Hi all, new guy here, thanks in advance for any ideas. I recently bought a Alura 35 with twin Marine Power 5.7 straight inboards. Issue: port engine misfires after an hour of run time. I did full tune up (no other issues just for baseline) including plugs, coil, caps, wires, rotors, oil change and raw water impellers (FWC engines) they both start easily, idle well and run smoothly but after 1 hour port engine misfires/backfires etc. a bit less after tune up but still an issue. Temp is 160 oil pressure 60, I’m out of ideas for temperature related stuff thanks!