1997 Chevy Cavalier faulty sensor

Check the fuel pressure with a fuel pressure gauge designed for your system and comeback with the readings this is where we start.

Does it crank with no start?
Do u have a security light on or flashing?

If so separate ignition key from the key chain and the rest of key place in ignition and turn it on for 10 or so min
and then give it try
if not check fuel pressure
check for spark
if you have an alarm system make sure its disabled