318 is doing something stupid?

I have a 99 dodge ram 1500 with a 318. It runs great but has a whistle under the hood. I found it is pulling almost 15 inmg through the left valve cover. PCV is on right valve cover. Left valve cover has oil fill cap and breather hose that leads to the air filter. I can pull the hose from the valve cover to the air filter off the filter housing, put my thumb over it the the whistling slow comes to a stop, but it is building up vacuum under the valve cover. I can pull out the PCV valve and it still does it. HELP!!!!

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    the pcv on one side leaves a breather goes on the other but that should have low pressure air to it. if you hear a hiss, that could still be it but the hose may be due to be replaced.

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