Cant figure it out afrs are going crazy during idle 13.8 then lean, and samething again. driving holds a steady 13.8-14.2 "closed loop for me" but boost guage is holding a steady vaccuum, boost is fine. Ac smelled like smoke earlier today

Changed plugs iridiums were ok previoisly
Head gasket not leaking because plugs looked good
Plenty of oil

Remaining possibilities
Fuel pump - probably not plenty of fuel at top end
Injectors - possibly not. 93 octane flow tested about 5-6 months ago
Low compression - maybe
Boost leak - maybe
Front o2 - good and working
Turbo dying
Wideband sensor failing

Amy other possibilites?