The tube is part of your evap system. It feeds back into the engine compartment and hooks to a series of hoses that eventually end up in the back of your upper plenum.
Down by the ac dryer there is a purge valve. I believe it goes to that, then connects to this red/black vacuum hose which you can see going to the eec valve then into the back of the plenum.
i followed the red and black wire and got to a little round thing but there is alread a hose there. this hose comes from the same place though. errrrrrr.
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