In the Nissan world, the biggest typical mistake I see is careless maf plumbing, and open to atmosphere blow off.
You should recirc your blow off with a typical draw through maf system, and pay attention how its plumbed yo not introduce turbulance to the maf.
Plugs, 90% of applications shoukd use copper NGK 4644, gapped at 0.026".
Stock pump wiring sucks.
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