2000 Chevy impala

Are you getting injector pulse? If so then the computer is fine... you can backprobe the injector wires and use a test light from battery positive to the probe your using and see if the test light pulses while cranking.... also check fuel pressure is reach at least 50 psi with the key on and make sure its holding

These ignition control modules will fire with a 3x or 7x crank signal alone ... depending on if its 3400 or 3800 and dont need the computers involvement for spark output, so just bc the car has spark that cant tell u if the computer is good or not