92 camaro

i have a 92 camaro i changed the gas tank fuel pump and injectors it gets gas to the in jectors i tested the in jectors they have 12 volts going to them but they dont spray any fuel what controls the injectors this is a 305 motor thanks this is throttle body injected two injectors

I do not know specifically about the TBI cars but I know on later stuff the computer controls the ground and the injectors have a constant positive feed.
If you are seeing voltage at the injectors it sounds like the TBI setup operates the same.