P0171 code. Runs Great but the warmer the motor gets it starts to hesitate.

So that would make it run good cold but hesitate when its warm?

The information on the link provided a list of components that should ALL be evaluated to pinpoint the problematic one. The video showed the evaluation of P0171 with the use of a professional scan tool. That being said, if the hesitation occurs after eight or so minutes of driving, the air diverter system should be a top of the list suspect, but the other components still should be evaluated for proper operation.