Good day everyone, I observed that with my Kia Sorento 2005 model, sometimes the tachometer drops to zero while in idle throttling and the engine vibrates a lot. The car can still move but is very slow with this condition. This issue comes up intermittently and the check engine light had come on about a month before I observed this problem. Please any suggestions on possible causes of this issue are welcome. I am in the middle east and communication with mechanics is a big problem so any clear and more definitive info will really help. Thanks a lot everyone.