Pinch the fuel line where it leaves the regulater for the tank to check for
low fuel pressure caused by the regulater.I guess it can get stuck the
other way too. Not too common though. I havent theard of it on the list.I
guess ,if I was going to test for a high fuel pressure,I would stop the
fuel pump and see if the engine runs better as the fuel is used up in the
lines and rails. That black box in the engine compartment has 2 relays.Take
emout to check this.Finally as the fuel is all used up, it will not even
rev .Like when you last ran out of gas(ha ha).