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Place your hand on the circuit opening relay. Make sure the key is in the on position. Have somebody lift the top of the air cleaner up so that they can reach their hand up inside the mass air flow meter. Have them push the mass airflow door open about 1/2 inch does the circuit opening relay click on and do you get fuel pressure?
So just to clarify if the jumper wire is removed from the fuel pump and B+ connection and you hold the mass airflow door open slightly the truck will idle? If this is the case did you make sure that the induction boot is not cracked or broken it's very common for that large rubber boot to crack and not see it and it will suck air and not open the mass airflow door. I have two make a run to the store for the Mrs. I will be back and look into the wiring diagram to see what's going on here.
When you push the door open and the mass airflow sensor does it appear to have the same amount of resistance the entire way is pushed open? Does it seem a little heavier to push open when you first start to move the door? It's not likely electrical problem otherwise you would have a code set in the computer. The contact points in the mass airflow meter activate the fuel pump once the key is released from the start position and the engine is cranking over. If you listen carefully how far does the mass airflow sensor have to be pushed before the fuel pump/circuit opening relay activate?
What is the color coding of the of the wires going to the mass airflow sensor? Carefully pull back on the rubber boot that goes to the connector. I just want to verify have the right wiring diagram. Also check to make sure none of the wires are broken I have seen where the wires will break off the end of the pins in that connector right inside that rubber boot.