1996 regal wont start

We just replaced the cam and crank sensors and the car ran fine for a day. Now it did like before we replaced the sensors, just turns over but no fire. We have also tried replacing the coil pack and computer.

Welcome to AF, no fire meaning no spark I assume? You should scan it and see if you have cranking rpms, if not, suspect a bad signal to the icm from the cps or wiring to the pcm from the icm, look for frayed or pinched wires. Also another assumption, 3.8? Try and post all pertinent info in the future