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engine light is on,code reads 3rd cylinder misfire on 2004 Mitsubishi Diamante

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
car has 111,000 miles,never had the fuel injectors cleaned, spark plugs, wires and distributor has been replaced at around 60,000 as well as the timing belt, same time
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Your due for spark plugs if you only put in a platnum plug back at 60k. Do you remember what type of plug you put in back then?