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Q: check engine light code misfire cyl 4. I have changed the plugs & coil wire. on 2004 Hyundai Sonata

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
could it be a weak coil. The copil is on cyl 4 but I think it serves cyl 2 also.
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