Runs great in all gears 90’000 miles Now has a high level whine when. Accelerating even when. Still and in neutral. With. A/c. On or off sounds like a jet spooling up. When pressing gas pedal it gets higher in pitch as. You run engine up the lowers when you take foot. Back and off. All gauges fine no other problems with car. But. Worry some sound.
Check your serpentine belt (accessory drive belt) first. It could also be the alternator, or the water pump.
I think you may have a bad idler pulley.