4.6 Triton engine
Yup, same symptoms. A bunch of error codes and searched online and it's the PCV vacuum jose. In my case, it was just the rubber elbow that wore down.
I went to a bunch of places.
Ford dealer wanted $75 for the plastic hose and elbow. They said they did not sell just the elbow, which is rediculous since you can slip off the elbows very easily.
Pep Boys did not have an elbow the right size.
Autozone first sold me the rubber hose with bends similar and I was going to use this, but when I found out that the elbows just slipped off, they found the elbow for me. It was slightly different, but worked just fine (so far).
I thought I would include some crappy cell phone pix to help others locate it. Note that it's not the small metal plug that is near where I highlighted.. I had to remove that hose to get to the other one. Also, the smaller hose will have about a cup of radiator fluid come out.
And here is where the other end of the hose goes (the blue plug thingy):