|Originally posted by Gall757: Could you expand on that comment a little?|
I think I can help with that. IIRC, he has a Trueleo intake and Buick GN throttle body on his 3.4 V6. (I have the same setup) The GN throttle body doesn't use an idle air tube, so the idle air tube fitting on the lower intake gets capped off. Apparently, that cap deteriorated and caused a big vacuum leak. Now that the vacuum leak is fixed, he feels that his engine has less power than before.
My advice would be to fix the remaining issues with the sensors, get a wideband O2 sensor on it, and go from there.