Need help to locate and identify this noise that's happened over the last few weeks or so , you here it at the beginning when I come off the throttle then back on , not driving hard just pottering , it sounds like a electric sewing machine and really only seems to here it in 3,4 and 5th gear from about 2k revs upwards and seems to go quicker the faster I go , doesn't get any louder just quickens up and I can't hear it if I open window , excuse the state of the car it's not cleaned on the inside for weeks 🙀🙀