I search and found this issue.
"I am not sure but he open the dashboard drawer and pull it out. behind that drawer there was a lot of electrical circuits and component and one of the relay was not working. He told me that if you turn on your AC there is no impact on the RPM of your car its mean that this relay is not working. Turning AC on and off should impact on the RPM of your car but bcz that relay was not working so may car RPM was consent even when i turn on my AC. so when he replaced that relay car RPM started to up and down while i turn on my ac. he also set the RPM to 1200. now i can feel that is vibration less
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