yeah, it is very possible the pcm has bought the farm, like sm105k said earlier. unfortunately it is not a straight swap from your dad's truck to yours, due to security issues which would not allow your vehicle to start/run. You would have to be out of pocket for a new pcm unless you can convince the dealer to return to the last revision, or asbuilt version.
If a faulty piece of hardware cannot be found, either a sensor is dead or the computer that takes input from the sensor is corrupted. If a sensor is dead, the computer sets the appropriate code. You can try putting in new MAP sensors, but that is a pure parts cannon play. May or may not work. We used to have problems with Gen 1 & 2 SHOs where the PCM would not have any codes, seem to be working properly, but in reality, needed to be replaced/exorcised.