Truck doesn't like to start when the engine is warm

Hello,

It sounds like you might have a faulty crankshaft positing sensor.
The crankshaft position sensor sends signals to the PCM which triggers the engine to start.
Over time the crank sensor will start to loose its internal calibration due to heat and vibration of the engine.

When a crank sensor starts to fail, its performance gets impacted by temperature.
Typically hot engine will trigger it and it will not provide signal and the engine will not start.

You might find these articles helpful:

https://www.2carpros.com/articles/how-a-crank-shaft-angle-sensor-works
https://www.2carpros.com/articles/symptoms-of-a-bad-crankshaft-sensor
https://www.2carpros.com/articles/crankshaft-angle-sensor-replacement

I have attached diagrams for your reference.

Please let me know of any questions.

Thank you.