car shaking when turned on on 2001 Audi A6 Quattro

I think its a spark plug

Asked by for the 2001 Audi A6 Quattro
It might be, but unlikely unless the plugs haven't been replaced for over 30,000 miles. You shouldn't drive the car while it is misfiring, so try to diagnose which cylinder is misfiring and diagnose accordingly.
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