Buick's idle speed is unstable in the new century.

The causes of this situation are ignition system and fuel system problems and engine bracket damage.

1, the reason is that there are problems with ignition advance angle, ignition coil and other components, and there are problems with nozzle and oil circuit. The solution is to replace these components.

2. The reason is that dirty throttle will affect air flow and fuel mixing ratio, thus affecting idle stability. The solution is to replace the engine bracket.