i need to change a pcv and i cant get it off

Remove the PCV valve with a pair of pliers. I make break apart so use caution not to leave any pieces in the engine. remove the grommet and replace it as the rubber is old and deteriorated.

Try using a dull butter knife to pry up the donut shaped gasket that holds the PVC valve into the valve cover, Once you have the PVC and donut out you can remove the piece of PVC valve. Then push the donut back into the valve cover then reinstall the new PVC valve.