1994 Oldsmobile Cutlass Ciera stalls after extended driving/ restarts in 20 mins

these cars have a tremendous amount of icm(ignition control module) issues that will produce the very symptoms you describe.if you follow the spark plug wires back from the plugs to the coils.and the coils are mounted on top of the module,it is about 8 inches long,4 iches wide ans a 1/4 thick.you can remove it,be careful to mark everything for re-assembly., and take it to any parts store for testing.

ignition control module