I know that the one that splits three ways, one small one is for the EGR and the other small one is for the fuel pressure reg and the one in the middle goes the the vaccum tree on the fire wall. There was one on the front that went to the fuel vapor canister and one is for the pcv valve that goes to the back of the lower intake. Hope this helps
If you broke the fitting off inside you will need to remove it, try an easy-out depending on how big it is. If there is any left sticking out try to get a pair if vise grips on it or very carefully get it out with a hammer and chisle.