The car of Wuling Light bought by my cousin ran for more than 20,000 kilometers, and it felt a little stiff and bumpy. How can this happen? Can Anshan be repaired?

First of all, I suggest you go to the 4S shop to clean the throttle and nozzle (reset with the detection computer after cleaning), which may be caused by poor road conditions and excessive carbon deposition. Secondly, check the spark plug and high-voltage wire. It may also be caused by poor gasoline quality and aging exhaust pipe. It's best to go to the 4S shop for a comprehensive inspection to prevent wasting precious time.