1994 Ford Taurus

It will not crank again until it sits for 30 or 45 minutes, if you mean refusing to start-get a carb cleaner ready when it happens do below this will tell if its fuel or spark problem

Get a carb cleaner and spray into the carb or the throttle body on an EFI. Did it start and die? If not disconnect a sparkplug wire or 2 and ground it to the engine -have helper crank engine over-do you have a snapping blue spark? If so-you have a fuel problem, check the fuel pressure to rule out the fuel pump/pressure regulator and listen to the injector/s are they pulsing or hook up a noid light. No snapping blue spark continue to troubleshoot the ignition system-power input to the coil/coil,distributor pick-up coil, ignition control module, cam and crank sensors-

Or go to this link https://www.2carpros.com/first_things/car_cranks_but_wont_start.htm