25W公里1.4T老明锐，偶发性缺缸越来越频繁

5053扫出来的故障码一堆，发动机缺缸的问题越来越频繁。
大侠们请看看是是啥原因：
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地址 01: 发动机 (CFB)       标签: 无
   零件号 软件: 03C 906 022 BG    硬件: 03C 906 022 BG
   组件: MED17.5.20      G   6689  
   版本: D5H10---    序列号:               
   编码: 0000071
   服务站代码: WSC 00078 000 00000
   VCID: 62CBCCBEBD0D8356FB-8036

6 个故障码已找到:
000768 - 随机/多缸 
               P0300 - 000 - 检测到不发火 - 间歇
             故障发生环境要求:
                    故障状态: 00100000
                    故障优先级: 0
                    故障频率: 6
                    自动重置计数器: 255
                    里程: 247822 km
                    时间标志: 0
                    日期: 2012.04.27
                    时间: 18:50:17

             故障发生环境要求:
                    发动机转速: 1185 /min
                    负荷: 31.4 %
                    车速: 36.0 km/h
                    温度: 91.0*C
                    温度: 36.0*C
                    绝对压力: 1020.0 mbar
                    电压: 13.843 V

000771 - 3缸 
               P0303 - 000 - 检测到不发火 - 间歇
             故障发生环境要求:
                    故障状态: 00100000
                    故障优先级: 0
                    故障频率: 7
                    自动重置计数器: 255
                    里程: 247823 km
                    时间标志: 0
                    日期: 2012.04.27
                    时间: 18:50:59

             故障发生环境要求:
                    发动机转速: 779 /min
                    负荷: 18.4 %
                    车速: 1.0 km/h
                    温度: 91.0*C
                    温度: 33.0*C
                    绝对压力: 1020.0 mbar
                    电压: 13.716 V

000768 - 随机/多缸 
               P0300 - 000 - 检测到不发火
             故障发生环境要求:
                    故障状态: 01100000
                    故障优先级: 0
                    故障频率: 13
                    自动重置计数器: 255
                    里程: 248874 km
                    时间标志: 0
                    日期: 2012.07.04
                    时间: 14:50:03

             故障发生环境要求:
                    发动机转速: 1202 /min
                    负荷: 27.8 %
                    车速: 49.0 km/h
                    温度: 30.0*C
                    温度: 12.0*C
                    绝对压力: 1020.0 mbar
                    电压: 14.478 V

000769 - 1缸 
               P0301 - 000 - 检测到不发火 - 间歇
             故障发生环境要求:
                    故障状态: 00100000
                    故障优先级: 0
                    故障频率: 7
                    自动重置计数器: 255
                    里程: 248866 km
                    时间标志: 0
                    日期: 2012.07.03
                    时间: 16:34:06

             故障发生环境要求:
                    发动机转速: 1163 /min
                    负荷: 50.6 %
                    车速: 45.0 km/h
                    温度: 24.0*C
                    温度: 6.0*C
                    绝对压力: 1020.0 mbar
                    电压: 14.351 V

000771 - 3缸 
               P0303 - 000 - 检测到不发火
             故障发生环境要求:
                    故障状态: 01100000
                    故障优先级: 0
                    故障频率: 13
                    自动重置计数器: 255
                    里程: 248874 km
                    时间标志: 0
                    日期: 2012.07.04
                    时间: 14:50:03

             故障发生环境要求:
                    发动机转速: 1202 /min
                    负荷: 27.8 %
                    车速: 49.0 km/h
                    温度: 30.0*C
                    温度: 12.0*C
                    绝对压力: 1020.0 mbar
                    电压: 14.478 V

000769 - 1缸 
               P0301 - 000 - 检测到不发火 - 间歇
             故障发生环境要求:
                    故障状态: 00100000
                    故障优先级: 0
                    故障频率: 1
                    自动重置计数器: 255
                    里程: 247413 km
                    时间标志: 0
                    日期: 2012.04.20
                    时间: 20:13:41

             故障发生环境要求:
                    发动机转速: 1379 /min
                    负荷: 20.4 %
                    车速: 55.0 km/h
                    温度: 91.0*C
                    温度: 30.0*C
                    绝对压力: 1010.0 mbar
                    电压: 14.097 V

就绪状态: 0000 0000

前几个月去检查过一次，修理厂把火花塞拿出来看看貌似还可以，点火线圈也换过没啥作用。