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This will normally mean that you need a good tune up. It could be bad wires to a bad plug. ETC....

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โˆ™ 2006-03-27 04:22:48
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Q: On a 99 gm sierra 2wd 5.3l check engine light flashes then stays on for a while code says freq misfire unable to determine source engine runs rough when this occurs and then corrects itself after mile?
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