Oh, i see, well im not sure how the 4x4 system is on those, but that almost sounds like one of the problems with these IWE systems, if there is a leak in the system somewhere, the vacuum willl get low during acceleration or load and cause the IWE actuators to try and engage. Just another thought.
2012 F-150 XLT 4x4 EcoBeast SuperCrew
2007 F-150 XLT 4x4 5.4 SuperCrew - Leveling Kit - Magnaflow Cat Back - Tonneau cover - Traded
2004 F-150 4x4 S-Cab, 4.6, Auto, Edge Programmer - Traded
Everything You Wanted To Know About IWE's