On my 2004 with a 3.0 under the intake there is a vaccum line it runs from the back of the engine to the front. Well one of the vaccum lines broke where it conects to the engine and I was wondering what its for. If I can I will try and get a picture of it when its light out tommorow

 

Bump I still have not gotten a picture but its the one under the intake runs right down the middle of it. I will try and get a picture the next time I see my truck

 

mine melted or something and started throwin a code and when i drove it it seemed sluggish onced i replaced it everything was fine but i have a 4.0 prolly the same thing tho