[RichardJ]

Boog mentioned that the grommet is probably hard as a rock. A new grommet will seal better and make it easier to take that hose off/on.

The simple tool below is used for checking the PCV System. With the engine idling and the oil fill cap removed, this is placed on the fill hole for a go/no go indication.

You can also just place the palm of your hand over the fill hole or a strip of paper. There should be a slight vacuum felt.

If there is smoke coming out the fill hole, the PCV is not working or there is way too much blow-by for the PCV system to handle