hello everyone. just wanted to say great site. i have 2 questions 1st when removing rear o2 sensors are the front sensors bank 1 and the rear ones bank 2 its for my 02 5.3 o/s 12156. 2nd question is i put in a btr stage 2 cam everything else is stock but i cant seem to get it to idol correctly i tried some pointers from this site and some youtube videos but i must be doing something wrong. just wondering if anyone has the same setup as me that can give me some tips it would be greatly appreciated. thank you