What is the reason for the lack of high-speed power caused by idling jitter of Bluebird 2.0 engine?

Hello! General reasons for lack of power and inability to refuel: 1, fuel system is blocked, such as nozzle, gasoline filter or fuel quality. 2. The air intake system is blocked, such as air filter and air flowmeter. 3. The ignition system is not easy to use, such as spark plugs and high-voltage lines. 4. The gas distribution phase is wrong, for example, the intake and exhaust valves are not tightly sealed. 5, exhaust system congestion, oxygen sensor failure, etc.