2007 Nissan Truck wont start when cold

Have you checked for fuel pressure? Try a squirt of starting fluid. If the engine runs on that for a few seconds, the fuel pump body may be warping and stalling the motor.

If the fuel pressure is correct, and the engine starts on starting fluid and stays running, the best suspect is an incorrect reading from the intake air temperature sensor. If it reports a temperature that's too high, not enough fuel will enter the engine for easy starting.