there are 2 major vac lines on the back of 2.3l ford ranger wherre do they go

Question

on a 2003 2.3 l 4 cyl ford ranger there are 2 major vacuum feeds on the back of the intake manifold 1 splits into 2 small ones those are ok the otheris a large hose that i cannot figure out where it  goes to any help???

Answer 1

Here try this diagram