Originally Posted by WowMike2001
Yep, that gets plugged directly into the air circulation system around in there... I wouldnt worry about it being cracked, it shouldnt have anythign go bad with it.. but if you want to make the engine perfect and such.. feel free to :-)
Actually DO worry if it's cracked. This hose moves crankcase vapors from the valve cover to the intake manifold so they can be burned off for emissions.
Since this hose connects directly to your intake manifold via the throttle body, it can create a vacuum leak and will cause poor performance, bad gas mileage, stuttering idle, and other symptoms. More than likely, the crack you're seeing is only on the outer portion of the hose, but it may already be leaking!
I would recommend stopping by the Ford dealership (not sure if this one is available in retail auto parts stores without doing a special order.) ASAP to get this replaced.