I replaced a blown engine in my 06 Mustang with one that came out of a Mustang that was rear-ended. Everything is fine except that I am missing a hose/line and not sure what its for... It is located on the drivers side, right behind the throttle body. Is this the PCV valve vent hose? or EGR hose? There is a hose on the passenger side that is hooked up. I broke the hose off of my old engine and the new one that was put in didnt have one connected...

Any help would be greatly appreciated!

 

Is it the house that goes from the front of the manifold (behind the throttle body) to the valve cover? If it is, then yeah it is for the PCV valve.