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You said that the injectors layout followed the firing order, should the wiring match the firing order instead of what was recommended as well? An I never found if a motor being a high out put was specific to sequential fuel injection or if it could be a ho batch fireAn ignition coil is an ignition coil, so the number of cylinders doesn't matter, 4, 6, 8, 10 would all use the same coil and produce "enough" spark
You could have a "bad" coil, you can't really test them, well you can test if they are "real bad" but can NOT test if they are good
So if you think its a spark issue then swap coils
In an 8cyl engine the Coil sparks 4 times per 1 revolution of the crank
So at 800RPMs the coil is sparking 3,200 times PER MINUTE
At 3,000rpm the coil is sparking 12,000 times per minute, that's 200 TIMES A SECOND
A failing coil can have a "delayed" recovery, causing misfires at higher RPMs
Coil needs time to "recharge" between sparks, doesn't need much but needs some
So its certainly possible for a failing coil to cause your issue
Yea last night after I was showing my buddy what sounded wrong, I went to check the stick and nothing was coming out, he said my oil might be pooling up on my pistons but, I checked the oil again today and it had oil in it, the motor sounds like its out of time or something, I can't rotate the dizzy without the engine just bogging and dying, the idle has becoming disturbingly low as well since rewiring, I took the number one plug out an it's covered in carbon buildup an was wet still from what seems like oilUhhh dipsticks don't usually lie...