Okay GPF, I have a problem. My '01 GTP has recently developed a misfire in Cylinder 1. Car has some mods including 3.5 pulley, 10mm wires, TR6 plugs, etc. I bought the 10mm plugs and installed them, it was fine for a few days then started misfiring. So I replaced the coil as they are original with 180k miles on em. Still misfiring. Now replaced plugs with new TR6, all gaped correctly. Still misfiring. I tested the 10mm and found its not the wire.
It only misfires under heavy throttle above 4lbs of boost, sound like it could be a lean misfire caused by injector?