I have a vacum port with a male fitting at the rear of my intake manifold(2nd from the rear) which has no hose on it and I cant seem to find a stray hose which would require a vacum source, it is approx a 2 or 3 mm hole.
I presently have it blocked but it was shiney so I'm thinking something came off of it.
The engine was filthy when I bought the niva and I never looked hard enough at hose routeing

