1992 oldsmobile 88 just shuts off randomly?

Everything just shuts off like u turned the key off and the only way you can tell that the car has shut off is the dash lights will come on. So when it shuts off its very hard to notice. It has a new ignition control module, new spark plugs, new IAC valve, new TPS sensor, new fuel filter, new air filter, new started, new alternator, and I believe that. I work at autozone and everyone I work with has no idea. Anyone help please!!!!!