Car is running lean on light throttle - any ideas?

[swinks]

For future, please get my advice from dd day and run 2 sensors, one stock narrowband and 2nd wideband. It's quick and not expensive job to weld o2 boss on top od de-cat. And you make your ecu very happy

[wintertidenz]

I have to agree with Tomasz here - a good narrowband with a wideband in place to monitor seems to be the way to go, because if the calibration ends up going out on the wideband at least you know the car is still running correctly.

Or alternatively get another kind of wideband - the AEM/PLX ones are good and aren't so sensitive to wiring. Not sure if they do narrowband emulation though.