97 rs camaro random/cyl 4 missfire???

Fuel injectors run off of .5 volts. To open and close the injectors, the computer grounds the circuit 4 that cylinder. Make sure that you have .5 volts constantly to each injector and the only real way to test that injector is working properly voltage wise, is with an scope or an expense diagnostic tool that is fast enough to notice if there's any variances. Basically, if you are in any doubt that your wire is causing to much resistance, replace the whole wire from the injector harness to the computer harness.