While at the back of the manifold, I managed to break the top off of this piece.
It has a plastic tip which a connector goes on.
This is just above the engine to transaxle bolts...just below that big hole at the rear of the plenum/intake manifold, directly below that hose nipple tree, above that big, shiny heat shield.
The stem is still intact, inside that white circle of plastic.
It appears to be threaded into the top of the "bell housing"...if that'* what you call it.
Anyone know what this is called?