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This question is really subjective. Since we are not there and cannot determine what is going on, it is going to be up to you to solve what you need to do. That being said, I'll give you two scenarios which might help you get to an end point in your decision. First: If you have the belt off and have access to the tensioner (pulley will spin free), grab ...


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.


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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