My car seems to do this everytime I reset the computer after going stage 2. The first place I was tuned to stage 2 they told me it was because of the APR intake I had, that the MAF signal was causing the issue. (which I never saw on stage 1)
After I drove around for a few days, it went away. I just was updated to the newest revision of the GIAC tune myself and it did this initially after they reset the computer after loading the new tune on. I've had it for about a week now and it no longer does that while building boost. I would just wait a few days before you start swapping out parts because it will probably go away on it's own and you'll have replaced perfectly good parts and spent money you didn't need to.
Edit: I just noticed how old this thread was, lol. Oops