1985 Supra

I have a banjo bolt on my intake manifold with three vacuum hoses. One goes to the Brake booster, one ( i think goes to the cruise control and the other is a mystery to me. Does anyone know where this vacuum hose goes? As it is it is just hanging free and plugged.
If you can help me please let me know. hopefree Thanks!

You will get better help in the maintenance forum - moved