Hummm.... I got a 34 GT-t Tiptronic, I also have a GFB Hybrid BOV, I have had it installed for about 15 months, it has been all good till now.
However recently I have also noticed my idle is going really low too, its stalled twice in the last 2 weeks, I am taking mine to nissan so they can connect it up to their computer to see if theres anything else wrong with the car. just as a precaution.
I checked all my hoses and couldent find nothing....
Let us know how u go if u do find the problem, likewise ill let u know wat Nissan say.