Pcv screams!!

Trying to figure out why and how to stop the PCV valve from screaming. When it's cold it makes a high pitch noise. When it warms up it doesn't scream anymore. I figured it was the old mechanical PCV valve, so I went and bought a new plastic style...found a grommet..seal good. STILL SCREAMS...:) What would cause this. I can pull the vacuum line and plug up the hose and scream goes away.

Any suggestions would be greatly appreciated.