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The chatter on your serpentine belt tension is normal operation. As the engine speeds up and slows, imperceptable to the naked eye, during normal operation the effect from the crankshaft is absorbed by the tensioner and avoids a code P0300-Random engine misfire. You need to check your vehicles electronics with a scan, before deciding on a plan of action.


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Does it make the vibration when in park? If not, I'd suggest you may have a vacuum leak after the throttle body or possibly your Idle Air Control (IAC) valve is not functioning correctly. If you are not experiencing any rough running at off idle, it has to be something which would only affect it at idle, or it could be slight enough that you are not feeling ...



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