Yes, when the truck is running and you check the vacuum on the side of the solenoid that the actuators are are on, you should get a constant stead vacuum. If you dont the solenoid could be bad if it completely drops off to nothing and then back up.
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