Why did my GM 454 Backfire at WOT?
Why did my GM 454 Backfire at WOT? I replaced the in tank fuel pump last month thinking it was fuel starvation while going up hills at WOT (wide open throttle). The fuel pressure with the old pump was low showing around 8 psi on the pressure gage that I permanently mounted 3 inches from the throttle body on the pressure line. What kind of fuel injection does a GM 454 have? Does his engine have 2 4 barrel carburater or a throttle body Fuel Injection. If a 4 barrel it might be the accelerator pump. I'mpretty sure Tim's is...