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R33Gtr Won't Run Properly. Almost Everything Stock

Komachi
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Komachi

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Hi guys. My car looks like having electrical problems. I hope you guys can give me some advises as I don't know what to check next.

Spec:

Stock MAF

Stock injector

Stock ECU

Stock coil stock ignitor stock harness

Stock BOV

Tomei stroker bottom end

Good compression good oil pressure no fluid leak at all. (Maybe an air leak however)

Fuel pressure is perfect as it got new fuel pump and regulator. I can hear the topfeed injectors clicking. Loud as hell indeed. All plugs are fouled but still make proper spark as checked visually. The exhaust has some marks of unburnt fuel. Even the bumper got some fuel stains.

The car will not run properly. First few times I start it it revs fine all the way to 4000rpm. But I must hold the pedal slightly to let it idle or it will rev lower and lower then die on its own. Then it will get harder and harder to start and then won't start at all. I don't have a consult port so I used the PFC to check sensor and everything appeared to me in check. Nothing out of spec and all sensors got voltage. Then I swapped stock ecu back and used a paperclip to check the stock ECU and after trying to start it shows up a code 21 (or 12? It's two slow pulses and one fast pulse)

More weird stuff....after the car stalls when I step on the accelerator pedal it seems its activating fuel pump for a split second...

I don't know where to check. I don't know what's going on.

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