Wont start

Back to my 1989 festiva; how do I check the computer injector/s ground driver circuit- as advized and could the Computer causing it not to run, I have done the following-
checked fuel system --getting fuel to the intake inlet port. Checked spark-its getting spark to the plugs, If I spray starting fluid into the throtle body engin runs for a short time but slow and sputtering
Pluged a noid light into an injector plug --no signal
Used a test light from battery ground to both termnals in the injector plug no sighn of power.