yeah, i knew it was something with the valve train and/or topend somewhere... I just didnt know if he was in the beggining, middle, or end of what he was doing so in my head i figured he could have been doing anything.......Oh well, but anyway thats the first ive ever seen a O2 sensor in that location on a 3800....LOL, I thought it was a special mod or something....well at least u have easy access to it