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Q:

high engine rev on 2003 Mitsubishi Galant

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
when I first start engine the engine revs up for about to 1700 rpm for about 2 to 3 minutes and then starts to rev down to a normal rev. My mechanic has not been to identify issue.
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