Good day, A thought or two. How does the key enter and move through the positions of the switch? If it doesn't make complete contact at the start location, it could stop short sometimes. You might spray some lubricant onto the key, then place it into the switch several times. Do this a couple of tim...

Good day, After reading and listening to the audio, one thing that might contribute to noises at idle can be a broken right side motor mount. It tends to make a rumble sound but could be higher pitched depending on what vibrates. The mount get exposed to oils and vibration and I have had to replace ...