Yes i messed with the firing order an it is right it was wrong and didn't run at all i think i got the vacuum lineS right now too. It pops and spits when you push the gas but then it will backfire and run good at about 2000 orso rpms and then it will surge real bad at idle like almost to the point of dieing and then evens out for a sec then strats to almost die etc.. I think it the computer trying to keep the timing but i thought if i had some injectors plugged wrong then that might be it. Ii don't know how to check the codes though the engine light is not on but it did come on once. It ran good when i parked it to pull the motor for the rod knock. Good news is the knock is gone and the build was good