7-8 psi at idle is pretty dang low. I would expect that your gallery gaskets are compromised. You'll probably see pieces of the gasket blown out or find some bits of gasket in the bottom of the oil pan. Recommend replacing them with the EPS kit that includes new hardware.
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2011 370Z 6MT Sport Gun Metallic | ARC | CJM | Ecutek | FI | Fujimura | R2C | SPL | Stillen | TWM | Z1 | ZSpeed |
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