I am seeing more of this lately. You get a truck in with a low power complaint and maybe a check engine light on or sometimes not. You may or may not have codes to help you diagnose but this can affect the turbocharger and the EGR system. If you find yourself starting to perform pinpoint tests for air management and come up empty, before you beat your head against the wall spend 30 seconds and remove the MAP sensor and look at it. If it is clogged try an new one. Even if it is within the voltage