Injectors not opening or "flashing" on 1989 camaro

There are a few possible causes of the blocked fuel injector in your car: mechanical failure; electrical problems; damage caused by overheating; and the most common reason, blockage caused by grime. The best way to avoid injector problems is to take your car in for regular maintenance and use the occasional fuel additive specifically designed to keep fuel systems clean
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Ok You Have good connection to the ECM but did you check to see if you have good connection from ECM to the injectors or do you have signal from ECM going out to the injectors? Just because you have power going to the ECM doesn't mean it is good, when you read the resistance on the ECM all you did was verify that your coil in the injector was good, it did that the ECM was good. Sounds like you need to replace the ECM if you decide to replace the ECM be sure that you grounding paste/Thermal Paste when you do because if you do not your will fry the ECM in a very short period. But also remember that you can buy a brand new one and it not be good, which is why there is the warranty on the automotive parts you purchase at the auto parts store..