Range Rover Sport 4.2 SC Misfire problem

Hello everyone,

I have a problem with misfire on random cylinders mainly at low idle and after releasing the gas pedal during normal driving (these are the words of the mechanic). The engine starts properly, no wavy rotation.

I also got check engine and errors P0171 and P0174.

So far the spark plugs have been changed and the ignition coils have been replaced. With no effect.

What next steps should I take?

Those codes are both bank lean codes don't know why you have changed plugs and coul packs for that.
Usually maf sensor genuin only no chinease crap