So i have a 04 mercury sable and im having issues to fix i need some input what might cause it. So im misfiring on cylinder 6 and i get misfire on start up
i have changed plugs and wires and coil pack and fuel pump and fuel filter now im stumped dont know what to do next.
obd codes.
p0171
p0174
p0306
p0316
p0455
p2272