why does it keep dieing? on 1995 Ford F-150 Lightning

I replaced fuel filter,ign.module cap rotor,wires,plugs,coil,and all the cats (4) It will start and run great but when I shut it off It wont start and then I have to wait for at least 2 hours and than it will start back up...Help!!!did not receive any trouble codes...

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2 answers
could have a bad battery or alternator
Fuel pump relay getting hot.