Join Date: Jun 2010
Location: Chilliwack, British Columbia, Canada
Model: 1984 Interstate "Canadian"
I would not run it long term without the hose. It is letting a tiny bit of non filtered air into the motor. That hose is plugged up at the bottom, so air does not make it into the air box.
It will also defeat your PCV system and you may find oil leaks where none were before.
Advise given here is free and comes with no warranty "Caveat emptor"