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Q: service engine light will come on randomly, blinking rapidly to solid, maybe on 2000 Chevrolet S10

be on for 50-100 mi. light goes off maybe for 2-300 mi.no difference in the way it runs and gas mileage is good and consistent. codes say #3 cyl. missfire.
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there are several reasons a check engine light will come on.the best way to approach this is to have it scanned and the code read and diagnosed.
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