I also have a 1995 Pontiac Grand Am, Quad 4 engine. I have not yet figgured mine out, but have replaced fuel filter, checked plugs, replaced injector wiring (which was in poor shape) ect. I found a procedure in the Haynes manual I am about to try. It may help you as well. Since it jumps around to different sections of the manual and because of copyright issues I won't post the entire procedure, but I will tell you where to find it.
Haynes Repair Manual 38025, Chapter 5, Page 5-9, Section " Engine cranks over but won't start"