Car cuts off randomly what cod cause this?

What is your question?

2002 Buick regal car just cuts off randomly and then it won't start back. I changed the spark plugs and wires, crank shaft sensor, harness to the crankshaft sensor, fuel filter, air filter, and got a new battery. Timing belt is good, alt is good, and the fuel pump was changed last year and just checked. The car is getting gas. What else could it be??? Is there a kill switch on this car? Please help me.