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I recently purchased a 06 civic ex sedan. One possible issue is the vibration I'm feeling from the arm rest center console area. When I initially start the car (cold start), I get almost zero vibration - the temp has not reached in the center and the RPM is at 1000. After about 5 minutes when the car has had time to warm up and the temp is showing in the middle, the RPM has dropped to around 6000 RPM at idle when it has significantly increased in the vibration I'm feeling. What is the normal idle speed? Do you think there is some issue with my engine? What could be the possible cause of the engine vibration I'm feeling? The car had 56K when I bought it, which is above average. As far as I could tell, the car looks in great shape. It is a manual by the way. Thanks.
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