Okay, yours is somewhat different, then what I was describing-
Those are not wires- they are vacuum lines, the purple is the source, from the engine intake that supplies the vacuum. the blue line must run towards the vent actuator, and is probably partially plugged, or leaking, such that when you move it, it gets full vacuum. Do you hear hissing, and then when it moves it goes quiet? that would indicate a leak. If no hissing, then probably sucked in some of the mushy manifold- and may have to be removed to examined and cleaned.
The vacuum gets changed to various lines by the solenoid valves inside that box, the manifold is attached to.