Try this.. after car is hot and then stalls, plug a spark plug and ground the tip on the body. Crank it over and see if you have spark. No spark means you can eliminate the fuel system and problem is in the electrical/ignition.
For an electrical issue, try this...after running for a little while, take the negative battery cable off while engine is running. If car stalls immediately, have your alternator looked at.
What is the volts in the battery after it stalls? If not over 12 then alternator is prob. bad too

If peeps already mentioned these, forgive my remittance.