How normal is the throttle opening of Buick Lu Zun?

Hello, Buick Lu Zun is an electronic throttle, and the idle opening of the throttle is completely controlled by computer. When the throttle valve is used for a certain kilometer, there will be dust such as carbon deposition on the throttle valve. At this point, the throttle opening is still controlled by the computer-increase the throttle opening and maintain normal idle operation. At this time, if the throttle is cleaned, the throttle opening will become larger, making the idle speed unstable or high. At this time, you need a matching throttle. Need to go to the 4S shop to equip with special instruments.