It sounds like the PCV is just leaking too much air at idle. All PCV's should close down to a small amount of air flow when the vacuum goes high at idle. The stock OEM Mopar PCV's seem to need 16-18 inches of vacuum to close down.
So what idle vacuum do you have? Is this a modified engine? if the vacuum at idle is something like 15 inches or lower, then the PCV will not close down like it should, and it will provide excess air to the intake. If you have a cam in the engine, and the idle vacuum is in the 14 to 15 inch range or lower, then you can change to a different PCV valve that will close down to low airflow at a lower vacuum range. We used a Fram FV191 in my son's 340 for this exact problem.