Originally Posted by simon-srt6
I'm glad I was able to help. It worried me for a while too. I still don't understand why it does it when warm for a few seconds now an then. It is supposed to be something to do with emissions control, at least that was what I was led to believe.
Its there to inject air into the exhaust manifolds to help get the cats up to operating temperature more quickly during cold startup; the no-SRTs have it too.