Help Identifying (loose) Vacuum Tube Please (pics)

[db_autotek]

Hello again friends, I have an obvious vacuum leak. Car is having the common vacuum leak symptoms, complete with audible vacuum "suck" sound coming from underneath the plenum... or as I lovingly call it, the spider-monkey.

Before I start pulling parts to find this tube's other half, I am hoping some members may help me identify it and where it may go.

The natural bend in the tube is heading up under the plenum. I have it laying up for the pics.

Obviously, I know what needs to be done and am not excited about it, but any comments or help may be greatly appreciated. Thanks!!

pic 1, the tube in it's almost-natural state, although the bend has it kinda heading up under the plenum.

pic 2, for reference.

pic 3, for reference...

[3Q Jay]

that one goes to the bottom of throttle body.

[maxnix]

Vacuum hose routing is almost uncomprehensible until one studies the engine with the top half apart, then after a few hours it all makes sense.