Here's the other thread where someone mentioned the bouncing idle and removing the postcat O2 sensors as a solution. This guy has an AA tune though, not BPC, further reinforcing my belief that the idle issue is due to headers and not the tune. However it would be excellent if BPC had a tune that would fix the idle. Let us know what you find out from Bob@BPC.
https://www.1addicts.com/forums/show....php?t=1194190