Today was the day I finally installed the PCV on my bike. Have been holding on to my custom PCIII for various software compatibility reasons (e.g. WinPep does not yet support the PCV data acquisition)
With all the issues around the PCV and Autotune, I had to take a closer look at what could go wrong and it did not take more than 1 minute to find the very first significant issue: Bad Digital Ground.
To read more about the test see here: http://www.starvmax.com/blog/from-the-dyno-room-pcv-investigated.html