So I have a 2010 Ctown Victoria that’s stumbling. So far I have replaced the MAS, O2 passenger side, passenger side all 4 fuel injectors, EGR valve, & fuel rail pressure valve.
However is still says Fuel system 2 Cl_fualt And my Fuel trim for bank 3 & 4 both still say -100%
But I also don’t have a check engine light yet.
There is no bank 3 or 4.
Look for vacuum leaks