1989 Buick Century INJECTORS NT COMMING ON

THIS CAR WONT START....I PUT NOID LIGHTS ON THE INJECTORS AND THEY ARE COMMING ON BUT THE LIGHT IS REAL DIM BUT THEY ARE NTO FLASHING. I DID PUT 3 COMPUTERS IN THE CAR AND ALL 3 DID NTO CHANGE PROBLEM. (2 AFTERMARKET COMPUTER AND 1 USED). I HAVE ALSO CHECK ALL THE WIRING. IM STUCK.