Originally Posted by jwick

No starting issues at all. I'm convinced that the ECU is expecting crankcase gases to be recycled into the intake. By venting that PCV I think it stumbles slightly expecting a little bit of rich air that doesn't come in. Of course it could be the other direction and when the crank case goes high vacuum it sucks in a bunch of unmetered air. I'm grasping at straws and I'm not a tuner

It's very minor these days but it's still there. My idle cleaned up a ton when I pull the post-cat O2s complete out.