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I have a few issues with my r33 gtst s1, I've had it for a couple of weeks.. All stock except for exhaust, gtr coil packs, after market fuel reg, bigger fuel pump I'm told and boost tee which is removed because I'm trying to get it running properly on stock boost... Main problem is at 4-5k rpm, it doesn't like to rev past... Only getting like 3-4 psi... Feels like surging in higher revs... Maybe fuel cut, but it's stock?? Turbo spools well, waste gate functions.. Just not sure where to start? Afm I cleaned, new plugs n oil... No apparent boost leak.. Stock ecu... Any suggestions would be helpful, thanks

Coil packs working properly?do u have a mate or anyone who can swap with u to see if it helps?i had an sr20 yrs ago was doin that too timed it 100 times always the same...turned the cas way past wer it should b and it ran good...so if all else fails maybe check ur cas or timing..

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