Anyone have boost leaks with the factory plastic truck manifolds?

I had some great performance after i got them sealed up, but it seems to be losing some pull lately... dunno if it could be another leak, or the fitting came loose again.

i'm getting a lot of turbo lag now, it usually starts to pull at about 1 - 2 psi, but now doesn't kick till about 6 or 7 psi now. I'm lost....