I recently purchased a 2013 Range Rover HSE (full size) approximately 69k miles on it. Shortly after, I got an engine light. Codes were pulled and were misfire codes P0306 P0305 P0315. Service tech said I needed a “surface update to my PCM” it was completed at the dealership. Two days later, car is
doing the exact same thing. It has a vibration upon starting the vehicle. I can shut the vehicle off and restart it and it runs PERFECT. Do I need a whole new PCM!?