Chevrolet Cheng Jing automatic gear starts a new motor and a new battery, which can be started occasionally for no reason.

There are only a few reasons. You should check one by one from small to large, and eliminate one by one: 1: Replace the air filter. The air filter is too dirty and blocked, which will affect the air intake. 2. Clarify the solar terms, and the blockage of solar terms will affect the airflow and cause this symptom. 3. Replace the spark plug. Excessive carbon deposition in the spark plug will also cause this symptom. 4. Check the high voltage coil. This sometimes happens when the ignition coil is at a high temperature. 5. Replace the distributor cover and distributor head. Distributor cover or distributor head can also lead to poor ignition and unstable idle speed. 6. If the idle speed is unstable, it is necessary to clean the fuel injector, and then check whether the idle motor works normally. You should focus on cleaning solar terms and replacing spark plugs, which should be caused by dirty throttle and excessive carbon deposition in spark plugs.