Car will only run when rich

So got a gen4 6.0 ls and when my wideband gauge is maxed out rich it drives perfect other then fuek consumption but when i adjust the fuel to the correct afr itll miss fire and carry on unless higher in the rpms and flat foot.

Any ideas ?

a) Is your wideband sensor accurate and reliable

b) What injectors do you have?

c) Do you have troubles idling

Idle is fine when at correct afr, just wont drive, about to change the wideband sensor to see if that is the issue but tried two gauges already.

As for the injectors they are stock.