Timing?

Bird in intake box?

Air, Fuel, Spark

If it starts then cuts off could be clogged something, intake - fuel filter or fuel pump starting to go bad - bad wires, plugs, or distributor.

May sound stupid but i dunno... is the coil separate from the distributor? Could be coil or coil wire.

Is it throttle body injected or carborated?

Has it started to smoke recently? (clogged pcv valve)

You wanna sell it?