你好哈罗斯?他为气缸盖做了一些工作。 (I rectify valve seats? I agree with JONI07, the first is mechanical elements of the engine if there is a good compression ...+-125-140PSI or more continue with ignition system ... (the coil and integral module when they fail to cancel all the cylinders) then if it is fine verify the circuits of the injectors verify signal in the injectors with a injector test lamp. Verify injectors ... but it is两次不寻常的同时...当然,我澄清一下这是雪佛兰的车辆,最好使用诊断策略,然后按照您在服务手册中找到的步骤进行操作...