2001 Saturn SL1 Engine no start

I have a 2001 Saturn. I drove the vehicle to the store, parked it and shut it off as normal. I came back a few hours later, tried to restart. No start! Engine cranks normally, plenty of fuel in tank, can turn the ignition key to the run position and hear the fuel pump presurise the system and stop as soon as it's presurerised. I turn the key to the start and the engine will turn over and immediately start for a few seconds but then not start. It still turns over. I will go through the start sequence again and the same thing over and over. Checked all fuses, connections, battery is good. Please help!