I realize this may not wok for the PCV boots or other parts in the PCV system. (it might though) However, when I pulled my plenum, I noticed a few loose vacume connections where the rubber boots met with the hard plastic lines. I used black silicone as a sealer and it seemes to work pretty well. I let it sit for a long time while waiting for parts to fully cure. I havent had any issues "yet".
