1993 Cadillac EL Dorado Engine turns, but doesn't start

I have a 1993 Cadillac Eldorado. It's in great condition, runs well. When I try to crank the car, the engine turns but it will not start. I recently replaced the Map sensor and that seemed to take care of the problem. Then I replaced the battery and the problem started again. The fuel pump works, I have replaced the fuel filter and there is fuel getting through the hose. The fuel injectors were recently cleaned with Lucas (I did a loop around the interstate to run it through). There is fire from the coil pack and the spark plugs were just replaced a week ago. The wires are in good shape and connected. I also reset the security system after replacing the battery in case the anti-theft device was activated when the battery was replaced. Have I gotten a hold to some bad gas? Or is there a problem with the ignition switch? I'm at a loss!