Or that all of a sudden mine just decided to run lean (up to 17.0) at cruise.
As far as I know that is normal for a AU at cruise. My parents stock AU Fairmont runs 16.5 to 17:1 at cruise. At first I think useless is right, that the cam might not be shimmed correctly or maybe not clocked in right, but I would think that would be the first thing they would have checked when your car was not making as much power as they thought it would. I am thinking now that a sensor plug or vacuume hose might have been bumped causing the computer to have a hissy fit.