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What is the current mileage?
Doe sthe idle speed go up and down or is it low?
What is the idle speed?
Does the idle speed go up and down or is it low?
OK this idle speed is correct and its not an idle concern causing this vibration. Since its been this way since you bought it then its a characteristic of the vehicle. You need to compare it to another vehicle the same to verify this. There are things you can do to isolate engine produced vibration issues which include loosening the exhaust mounts and transmission mount and engine mounts. Then shake each component using a pry bar then tighten them back down in order: engine, transmission, exhaust. This will relieve any tension in the powertrain from being improperly seated when it was built at the factory.
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