pontiac 2007 grand prix

if when hot may be crank sensor if on supercharged engine may be pump resistor

so i should try my crank sensor first?

quick way to test when it stalls if your able technically is check spark from plug wires and injector trigger.you would need to unplug 1 Spark plug wire .using a screw driver inside of hole on wire ground metal part of it keeping hand away from metal part have assistant turn key to crank.watch for spark .yes spark sensor ok no then check injector.unplug from injector.assistant turn over motor while testing ground signal at 2 pin connector.one is ignition feed other is ecm signal on off.still possible to be fuel issue

The first thing you should try is having it scanned for trouble codes. Without that you are just flying blind and throwing money at it while hoping for a magical fix. Second, if you are checking for spark, you need the proper tool (which is readily available at any auto parts store, and is not expensive.) My understanding is that the old school way of using a screwdriver and looking for spark, as mentioned above can mess up the electronics on modern cars.