The engine of 4GW 15B vibrates badly at 2200 rpm, but it doesn't shake after this speed. What happened?

Hello, there is something wrong with the engine. If the engine needs to work, it needs enough air, enough gasoline and an ignition system in good working condition. Any problem will lead to engine jitter.

In the engine ignition system, there are few problems with the ignition high-voltage line, so the main problems are the ignition coil and spark plug, because they are all wearing parts. When the performance of the spark plug is degraded or the inferior spark plug is used, the acceleration of the car will be weak and the acceleration will shake.

The fuel system of a car is relatively large and has many parts. If a certain part is abnormal or faulty, the automobile engine will shake when accelerating. For example, there is too much carbon deposit on the accelerator, the fuel injector fails, the gasoline pump fails, and the gasoline filter is blocked. Hope to adopt, thank you.