Q: started missing real bad, don't have any power. idles real bad on 2001 Mitsubishi Mirage

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no service light is on. Check for lose wires or hoses could not find any
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I went ahead and pull the spark plugs out come to find out one of spark plug had blown out. Seems the tread got mess up because I could not get the new plug started at all. Any ideas to get it retreaded THANKS