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...

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...