Under high Rpm is when the valve opens and releases the pressure,dunno is squeezing it would make it go but if U blow into the valve it should work one way!
the proper way to test your PCV , is to CLAMP the rubber hose from the PCV while the engine idles.
If its fine working order it will CLICK CLICK or rattle as the engine idles. If no noise its likely clogged or failed so time to replace with a new one
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