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Q: check engine light is on on 2000 Mercury Mountaineer

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
when stopped at light car idles rough . ckeck engine light is on
(1) Answer
sounds like you have some missfires. take it to a pro and get it checked so you dont damage the cat converter.

Roy
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