Stalling after twenty or thirty minutes

First check for spark when the no-start occurs. Also, listen for the hum of the fuel pump for one second when you turn on the ignition switch. If you can hear that, you are going to have what appears to be good fuel pressure, but if you are just looking at some spray from the test port, that is not a valid test. You need to verify the pressure is correct with a fuel pressure gauge. Running for that one second is why fuel pressure looks okay, but it's more important to know if the pump resumes running during cranking. If you do not have spark, chances are pretty good the fuel pump is not running either.

Have you read the diagnostic fault codes? If not, what led you to the throttle position sensor? What idle sensor are you referring to?