How to solve the jitter of Guangzhou Automobile Chuanqi 1.3t engine by replacing the spark plug, replacing the ignition coil and cleaning the throttle?

Hello, this needs specific inspection. First check whether the throttle valve is too dirty, too dirty, and initialize it after cleaning. If the fault has not been eliminated, focus on the following items: oil (oil pressure), fire (whether the high-pressure fire is normal), electricity (power supply and grounding of ignition coil and injector), cylinder pressure (not lower than the standard cylinder pressure) and timing (whether it is normal, whether there is tooth jumping or not, and rolling key). Whether the fuel quality is qualified. Basically, these can eliminate common problems, hope to adopt, thank you!