1994 Pontiac Grand Am having car problems

Start with the basics, and work your way up, Last tune up was? Wires plugs ALL filters? If all that is ok, check for a stuck EGR, then test fuel pump pressure, If it won't restart, determine what's missing, the engine needs three things to run, Spark at all plugs, gas to all cylinders, and compression in all cylinders, tho an engine may run lacking one in one cylinder, it won't run very well!
https://www.2carpros.com/car_repair_video/test_fuel_injection_pressure.htm
Go here and checkout our video.
https://www.2carpros.com/car_repair_video/test_engine_ignition_system.htm
and this one!
The other thing to check is the catalytic converter, might be clogged! Is the SES light on?

If it feels like it's misfiring, suspect the coil or ignition module, if it doesnt misfire, check your catalytic converter, it could be clogged.