I switched to blow thru as a last ditch effort at cleaning up my idle. I had tried everything from regrounding everything including the maf and ECU, replacing the IACV, resetting the tps, blah blah blah. Nothing worked until I went to a blowthru setup. It may have been that my bov was leaking at idle, but I was never able to confirm that by any tests. I personally just think that the turbo and recirc hoses were creating a lot of turbulence and that the maf didn't like it. IDK but it cleaned it up. It may have been my imagination, but I felt like throttle response was better too. The world may never know, but I'm liking it for now.