I noticed today that I get a whistling sound ( see video below) it went after 20 seconds or so. Was suppose to take the car to the dealer today, but got busy. The advisor checked and I last replaced my Sparks 65k kms ago so they need replacing so I told them when I bring in the car tomorrow to read faults and replace the plugs anyway as they need replacing. Also, I will let them see which cylinders are misfiring and swap coils and I will take the car and check it next day and bring it back if the issue is there to read the codes.
Note: when the rpm drops and then goes back up that was the engine on its own, not me.