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I’ve changed spark plugs, vacuum tested, fresh upgraded injectors, car has 18+ manifold with imrc’s locked out. (No tuning error). Car has no cats and long tube headers. Cel p0300 comes and goes and it will never direct me to a certain cylinder. I used forscan and saw that all the cylinders were...

I have codes P0300 and P0316!

I have an 18+ manifold with the imrcs locked out, lu47 fuel injectors and catback exhaust. My car will give me cel P0300, and sometimes p0316 which is misfire at first 1000 revolutions. I’m tuned on 93 and E85. I changed all the spark plugs and gapped them around 0.049-0.053. Checked all...