okay, so i have a plx wideband o2 setup, and when i am driving in say, 5th gear, and i let off the throttle, the guage says lean. under boost its fine, its reading 12.1-1, but its only when i let off the throttle, the guage shows 13, 14, 15, 16...18, lean, air...why is this? I am guessing that this is normal, because when the throttle is closed, no compressed air is being forced inside anymore and there can't technically be a lean condition caused by boost, but still can anybody confirm that this is normal?

 

It's normal. During decelleration fuel is cut.