Audi A6L2.8 is a bit slow to reverse. What happened?

Turn on the air conditioner when the car is cold, and the engine shakes slightly when the headlights are on. This should be that the throttle is dirty. Just clean the throttle. Generally, if the road conditions are good, it will appear every 20,000 to 30,000 kilometers; if the road conditions are poor and the fuel quality is poor, 1 10,000 kilometers will appear. A6L 2.8L four-wheel drive is not obvious, especially if it is a predecessor. It is recommended to go to the 4S shop for inspection and cleaning. If you can't bear to spend money and have no acquaintances, you can get it for 40 yuan, just wipe the throttle clean.