Removed the big plastic box on mine, and did not recall a mass air sensor. Don't think the 4.7l has one. If it did and it was removed, the vehicle wouldn't run correctly. Seems the purpose of that plenum box is to remove intake noise, hence, when an CAI is installed, sounds like "Darth Vader" at startup. I think what RWMorrison is referring to is the "air charge temp" sensor.
'06 White Sport:4x4,4.7L, K&N CAI,Flowtech Terminator muffler,Flashpaq,OME HD lift,RRO UCA,20" GF-X wheels 275/55-20 Nitto Terra Grappler tires,rear grab handles,tinted tails,front hooks.