How did the throttle body look? Mine was really dirty!!!! and I hit it with some cleaner and now its super quite. My only intentions were to fix the sticking throttle blade... which I did, but I also notice that when I turn my car off, it doesn't do that "one last breath, before sleep" thing anymore.
But I also used 3 cans of parts cleaner and 4 rolls of paper towel and about 150 q-tips to clean everything I put back on that wasn't getting replaced.
edit.... if u used a dorman intake... Just remembered that my new PCV holder wasn't holding it tight enough to the plenium, so I just used the original one, problem fixed!