When I am driving my 1993 buick century it will just quit on its own.?

It has had a tune up and battery was changed. Alternator changed.
When I am driving my 1993 buick century it will just quit on its own.?
Change the fuel filter, then check the fuel pressure. If it's low, then check the pressure right at the fuel pump. If it's low there, you need a new fuel pump.
When I am driving my 1993 buick century it will just quit on its own.?
Replace the fuel filter. A lot of time that will correct the problem. If not, have a fuel pressure test done. The fuel pump could be failing.