Originally Posted by frankeyser
When I was having these exact same issues what fixed everything in the end was a little high temp rtv and making sure everything on the needswings cai was snugged up. I took the tb off, lightly coated the seal with a little rtv, let it tacky up a bit, replaced and made sure it was all centered up, used my micro torque wrench to snug it up, re installed cai and not an issue since.
I also installed the needswings catch can at time I had the CAI off but doubt that had anything to do with the vacuum leak.