I have a 2022 Power Wagon that has a humming noise at 85mph when you are on the gas, let go of the gas and the noise goes away. Rear axle has been checked 4 times and the front axle has been fixed. Engine has been replaced. I still have the humming noise, there's another noise when you let up on the gas pedal and on acceleration it shutters. It has been to the dealer many times and they can't figure out what's wrong.