What are the symptoms of a dirty throttle body?

[Cooper]

The symptoms of a dirty throttle body are: 1. When accelerating, you may feel the throttle is sticky, heavy, the car accelerates slowly, the RPM rises sluggishly when pressing the throttle at idle, with delayed response, and the car speed drops immediately when releasing the throttle while driving; 2. It affects the precision and smoothness of engine air intake, with a noticeable issue being potential idle shaking or even stalling, as well as unsteady acceleration when pressing the throttle. The causes of a dirty throttle body are: 1. Driving environment, poor air filter performance, high dust levels in the surrounding environment; 2. Low-quality engine oil with high evaporation rate; 3. Oil vapor and impurities from the crankcase; 4. After turning off the engine, the throttle cannot seal completely, allowing dust to accumulate over time.