It could be a sticking PCV valve , that does not open/close all the way during transitions of high/low vacuum . it migth be worth using a fixed orifice PCV as a means to troubleshooting. and not a permanent solution if the fixed orafice valve can not evacuate cranck case pressure under all operating modes.
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Murphy's law - "Anything that can go wrong will go wrong".
-469 ,Butler 310+ Eheads, Hurricane intake portmatched by butler, Butler roller 230/236 @0.50 112 LSA, Johnson lifters, pypes 2 1/2" exhaust, 3.42 yukon duragrip lsd, holley sniper efi, hyperfuel efi tank +++
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