EGR Vacuum Hose Disconnected (?)(?)(?)

[Likethunda]

There is a little Nipple where a Hose goes on the EGR Valve (ON TOP)

http://just.razzi.me/photos/586616/0c7c6ed.jpg (http://razzi.me/p/586616)


If this hose is disconnected will it cause the EGR not to Open and Close?

if so, what are other issues My car may run into if this is disconnected.

[Likethunda]

Just wondering if this is the reason my car might be idling rough