Vacuum port identifier

[camoit]

There is also the ASV Air Switching Valve. and the CAV Coasting Air Valve.
But the location, angle and size looks like it's for controlling the purge valve of the charcoal canister. Is there anything on your truck that is not hooked up?
If you take a peace of copper wire and strip the insulation off of it. Then take 1 strand of the wire and stick it in the tube, where does it come out at? above the butterfly or under the butterfly. If above how far open does the butterfly need to be before it lines up with the throttle plate? 1/4 throttle, 1/2 or what?
Where did you come up with that picture?