HELP! Car dies!

Hey all. I need some help here. My girlfriend has a 96 Plymouth Breeze. The car runs for 10-15 minutes but will then die. It will not start until 15-20 minutes after it's ran. We've changed the fuel filter, plugs, and just recently the coil pack. I replaced the battery today, as it was dead as well. We got it running today and then it died after 10 minutes of running. The engine will crank, but not start. What's goin on with this thing? Is it the computer, fuel pump, crank shaft sensor? I'm clueless here. Not much of a mechanic, so I need some help. Thanks all.