Bought a all rebuilt 500efi that froze, new short block. Very low ecm hours. Put it in customers boat hooked it all up went to fire it up and no go, it barks on one cylinder on the 2,4,6,8 bank but that’s it. Squirt some fuel into the intake plenum and away it starts right up and sounds good. Bled the fuel system down and rail pressure at key on is 42psi. Any help would be aprreiciated, days like today remind me how great a Holley dominator carb is. Thanks