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Q: Jerking while idling on 2005 Nissan Sentra

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
Just bought this car from a dealer 4 days ago. Today I have noticed some jerking
or quaking especially when idling. Could this be a bad spark plug? I'm hoping for a simple solution and that they didn't sell us an expensive problem.
(1) Answer