What would make my vehicle start up as usual and run fine for 5 min. then die.

I had a mechanic friend over and we put his diagnostic computer on the vehicle late last night. We came up with the "Throttle positioning Sensor" being faulty. The dashboard display confirmed to check this also after we had messed around with the accelerator pedal while getting irratic voltage readings, (also showed the throttle wide open codes at this time). Still have plenty of spark