car is a 91 na and there is a hose that comes out of the 6 port induction area on the back side tords the firewall.. i think it is supposed to go the the cat for emmisions but not sure.. it has after market exhaust and my air pump wasnt hooked up.. trying to hook it up now but wanna know what to do with this hose would up load a pic but cant figure it out from phone..

 

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We gotta get a photo dude. There are a thousand vacuum hoses on these things.

 

If indeed it is the air feed to the cat, it ain't vacuum it's air from the pump.
Without the airpump or a cat to feed, the hose is useless.