1g-Car bucks at 15psi- BUschur Big 16g*** any ideas of what it might be?***

[BoostinLaser]

Im running a Buschur Racing Big16g with 550cc Injectors and a 255 hiflow fuel pump. I dont think i should be getting fuel cut. so Does anyone else know what it could be? Im not sure if it could be back pressure from my exhaust because i dont have a muffler on.>? But around 12-15 psi the car bucks. and a big 16g should def hold 15psi. If anyone could help me out in any way that would be great.. THANKS

 

[eclipse90gsxt]

With a 255 you are probably over running the stock fuel pressure regulator, and running rich. Have a way to log a run?

Or a vaccum leak, or holes in the IC outlet/inlet pipe, IC pipe off a little.