My engine is in a sandrail, and it starts and runs/idles real good, just replaced plugs, and i can drive in 1st gear okay till i hammer on it then it stalls out like no fuel, i have the fi and red light on so i need to jump the plug and flash some codes tonight but any ideas? im running a walbro 255lph gsl392 pump with stock reg. which seems fine, pump should run at 50-60 psi with the reg. controlling it on my fuel rail?? But seems electronic to me??