Help! My 2013 Range Rover Sport HSE Lux has a check engine light and an obvious misfire. I have checked/changed ignition coils, spark plugs, injectors (tested and swapped to see if new codes would pull for different cylinder, replaced one that seemed to not be functioning properly), cleaned MAF sensor, checked and replaced all bad fuses. Oxygen sensors and PCV valve replacements are on the way to me but I feel like I am banging my head against a wall. Any other suggestions?