Injectors won't fire

[CHDesign]

Hey everyone I have a 87 MIrage with a 4G63 swap. When I go to start the car I have air I have fuel to the rail and I have spark. The injectors however are not firing. WHen I tested the signals I was getting a good signal from teh resistor pack but I was getting a 12V signal instead of a ground signal from the ECU. Is my ECU Fried? I'm running a 90 ECU with a 90 wiring harness and MAF. If I try to start the car by before priming the cylinders with some fuel it will fire up but die as soon as that primer is extinguished. Any ideas??? Also when i turn on the ignition I heard a series of clicks from the motor maybe the ISC? But that only happens once in a while not everytime. Any help will be greatly appriciated.....oh yeah I looked at the ECU no signs of the caps leaking or burn spots on the board....would this just mean the ECU is fried or I have a wiring issue.

 

[J92EGSX]

look at your wiring diamgram and study the inputs to the ecu, if the computer does not see spark (even though it might be sparking) it will not fire the injectors. make sure the the ecu is receveing all of the inputs.