level 5 for roughness on cylinder 1 is at idle. the engine vibration and rotten egg smell is strongly felt in the cabin when driving. I have no fault regarding the injectors?..., and the plug (picture attached) removed from the cylinder 1 was corroded on the wire side but not wet despite the...

Suddenly my pet develop vibration and rotten egg smell from the pipe. after checking and replacing the spark and HT wire on the cylinder 1, nothing change... I keep the roughness in cylinder 1 and NO FAULT CODE. do not know what to do.. here is the diagnostic screenshot please advice. Thanks