I think they changed the location in mid-2006. Not sure which you have. Some are the very rear of the drivers side valve cover.
Here is where its at on my 2010 Gen II. http://www.ramforumz.com/showthread....308#post567308
At any rate the emissions sticker on the underside of the hood should show the location. You should be able to trace the hose from the air box to the valve location.