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Q:

car shaking when turned on on 2001 Audi A6 Quattro

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
I think its a spark plug
(1) Answer
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.