[Ronnie's.930]

For question #3 - look at the second diagram in this link . . . I bet this is the hose that goes from the throttle body to the thermal valve (#7) . . . this is part of the cold start circuit . . .

http://forums.pelicanparts.com/5922608-post4.html

JFairman does a good job of explaining what this component does in paragraph #5 of this post -

http://forums.pelicanparts.com/5572399-post6.html