When my car idles I feel a vibration which seems to be coming from the lower part of the engine. To feel the vibration I must sit in the car and focus on it. It can't be noticed while facing the engine with the hood up. I was thinking I may need to replace my harmonic balancer. What are the symptoms of a bad harmonic balancer? One of my engine mounts is new, the one most affected when the car is in drive, and the trans.mount is new also. THANKS
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