Quote Originally Posted by LSRacing View Post
I have seen a similar problem like this. the problem in our case was that the NB Front 02 sensor connectors were switched from the correct side. IE: The drivers side harness was plugged into the passengers side 02 and vise versa. This gave us the same issues you are dealing with. We swithced them and presto, everything was great. Hope this helps.
LSR, good call...

spx-7, take a close look to see if left/right NBO2 sub-harnesses are swapped (what are the wire colors, including stripes).