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Check for loose wires at the coil pack..ive had that issue on my SR and my older vq35 s13. both had one coil that had one wire loose..wiggling it would cause it to run on that cylinder or not.
also .20 gap is WAY to low in my opinion. that was probably causing you to miss up high RPMs.. you were experiencing ignition blow out. since the gap is so small, the spark is literally blow out in high RPM.
my 400whp Rb25 car used NGK BKR7e gapped at .28. never missed a lick.
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