how much is a few clicks? do you have ac? mine does that when im at idle and i have the heater set to defrost mode or air conditioning on .., the ac compressor will cycle on and off in defrost mode and the rpms will rise and fall.. but the vibration you describe sounds like you may need a tuneup and the load is just making it more noticable..??
no ac? does it do it all the time or just when it warm or cold?
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