Why does the Tianjian have unstable idle speed?

[Holden]

Severe engine carbon deposits, excessive dirt accumulation in the throttle body and intake passages, spark plug failure, fuel pressure issues, and various component failures can all contribute to this problem. Stalling caused by excessive carbon deposits: Carbon deposits typically accumulate in the throttle body, spark plugs, cylinders, fuel lines, and intake passages. These are coke-like substances formed when fuel is exposed to high temperatures. They are difficult to remove through ordinary physical methods and require specialized cleaning agents for removal. Poor fuel quality and clogged fuel injectors: Using low-quality fuel not only increases carbon deposits but may also clog fuel injectors, resulting in poor atomization. Additionally, inferior fuel directly affects combustion efficiency, increasing fuel consumption. Incomplete combustion produces carbon monoxide, which can accumulate inside the vehicle and potentially lead to fatal poisoning.