Anyone?

[pjq]

Is that possibly your brake booster vacum line that attaches at the front of the left (drivers side) intake manifold?
In my pic I unscrewed it at the flange instead of using the proper disconnect coupling, PITA.

[brian325is]

The Radium King is correct. It is the lower hose for the AOS. You can see it in post 5 at the bottom right of the AOS

[pjq]

On my car the AOS feed from the opposite head is a complete ribbed flexible tube, attaching at the bottom side of the AOS, earlier models may be different.

[brian325is]

If you check out the part numbers in post 3, there are 4 different part numbers for this pipe depending on the year of vehicle