Air/Fuel Ratio question
Hi everyone. Newer to the board. 2015 GT Premium/Auto. Just recently, I've noticed my air/fuel gauge moving around alot. When at idle, it is around 14 which is normal. But what I've noticed is that it is now moving around in choppy way at idle. Normally it would just kind of float around 14, but now the motion is more distinct. When I am decelerating, I now see it pegging at 20, then in floats back down sometimes going to 10 then back up around 14. I have not tested at WOT but was wondering if anyone with an automatic sees it the same way.
Stock tune, no mods other than roush axle back.