Devo,
Ok so the unit says that it is not running rich. ;) But the plugs say maybe so and the way it runs also maybe.
Do the 2 AFR setting values coincide with the readouts? 13.9 = 13.9 +/- a skosh or is it 13.1 = 13.9? Also WOT. So to try and be sure, go into the controller and adjust the AFR at idle to a lower or higher value and see the readout results.
Also as a check see what the % fuel trim is at idle on the controller, mine is about -29% as it sets.
