I need help repairing my 1987 Pontiac Sunbird...?

Ok so everything was fine with it one day. The next day I went to pick my brother up from school and when I went to start it started but kinda sputtered for a few moments and then cut off. I tried again and each time it does the same time. At first I thought I was out of gas but even after filling the tank its still doing it. I ave replaced the fuel pump, fuel injector, oil pressure switch, modules, and sensors. It has less then 70,000 miles. Can anybody help, I have been without a car for 3 weeks and its hard.