发动机出现异常严重的振动

Occurrence of uncharacteristic and severe engine vibrations

如果振动伴随着动力下降，那么发动机可能只在3个气缸工作

If the vibrations occur in conjunction with a loss of power then the engine may only be firing on 3 cylinders

应该进行维修检查：

1、检查4个火花塞

2、检查点火系统