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When should spark plugs be changed

(1999 Chevrolet S10)
in Carefree, AZ on September 07, 2015
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Popular Answer
on September 07, 2015
Every 4 to 5 years or about 70,000 miles. Depends on the driving conditions, weather, etc. These numbers are just a general rule of thumb. Vehicle performance and gas mileage should give you your answer.
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