Magotan cruise speed is high and low.

Idle speed is unstable, check and clean the throttle.

You didn't say how many kilometers your car drove. If the mileage is too much, it may be that the throttle and idle valve are dirty. If it hasn't been driven much, it may be the oil problem. The engine of this car has high requirements for engine oil, so it is recommended to add 98#. Pay attention to the scale of gas station and the quality of oil products when refueling. As for the metal friction sound of the brakes, if other foreign objects touch the brake pads, the brake pads will be almost worn. It is recommended to check at 4S point.