Trying to work the bugs out of an engine rebuild.  This weekend I noticed
that there are 2 vacuum hose connections to the throttle body--one in front
and one in back.  The back one is hooked up to the vacuum hose, but I
noticed that the back one (facing the bumper) wasn't connected to
anything--just sucking away.  Where should this hose connect?  Does it
matter if I just buy a T connector and splice it into an existing vacuum
line?