Car is not running right. Rough idle and misfiring under acceleration.

Wilson2608

Thanks everyone I’ll check into that this weekend. I’m leaning toward it being the cats simply because of how bad my car is running and it will not throw a check engine light. If i have half the power and my car is running like crap it should throw a code. My cat codes have been permanently disabled through uprev.

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Stillen G3, z1 Intake Manifold, Stillen Headers, Z1 HFC's, Stillen Catback. 330whp 267 ft- lbs tuned at Z1 motorsports.

Wilson2608

Sadly it is not the cats i checked them today. I’ll keep looking for the problem it’ll turn up eventually lol. Thanks for the reply’s

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Stillen G3, z1 Intake Manifold, Stillen Headers, Z1 HFC's, Stillen Catback. 330whp 267 ft- lbs tuned at Z1 motorsports.

Wilson2608

So here we are, the 370z still is running like ****. I took a break and focused on the 300zx but now I need to get back to it.

What I have tested:
Fuel pump
Injectors
Coil packs
Spark plugs are good
Air filters replaced
MAF and TB cleaned
PCV valves cleaned.
Checked for vacuum leaks
Replaced valve cover and spark plug gaskets( though for sure that would fix it as there was oil alll over spark plugs )

As i stated before I checked the spark plugs, they look fine and they have about 55k miles on them.

I’m making this post in hopes anyone has any other tips ideas. I’m kinda at my last ditch effort here. Gunna get my boost leak tester from 300zx to be 100% sure there’s no air leaks.

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Stillen G3, z1 Intake Manifold, Stillen Headers, Z1 HFC's, Stillen Catback. 330whp 267 ft- lbs tuned at Z1 motorsports.