Cant figure out whats wrong with my cougar?

What is your question?

Its having trouble starting, very difficult to start. And when it does start, it has trouble staying on. It will stay on for a minute or two tops, then the egine will start sputting then die out. I already changed the fuel pump, fuel filter, spark plugs and wires, and then finally the mass airflow sensor but none of them seemed to fix the problem, what else could be the problem?