84gls12a5spd- vac line below others?
 

On my 84gls 5spd there is an extra vacuum opening below all the others on intake manifold- Appears from haines manual that it has to do with automatic trans. should it be plugged? - last guy didn't, and I paid to replace a manifold gasket cause I was hitting opening with carb cleaner and thought gasket was blown!:eek:

I Believe it should be plugged. Thanks