ok i just put the 69 350 in and added all the nessary parts my old heads tbi intake and tbi and all wiring is all the same as before just a different short block., i start it and it runs for a sec and then shuts off then it runs for a sec and shuts off then i checked the fuel injector fuses and the ecm fuses and there all fine and now there is no fuel coming out at all, but there is fuel pressure but no power to the fuel injectors whats wrong here.