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why is my 99 s-10 pickup misfiring while driving and idoling.and engine light on 1999 Chevrolet S10

the engine light is on, and truck is misfiring

Asked by for the 1999 Chevrolet S10
Having this problem now. My battery is low so need new battery, spark plug 6 is missing firing, and my thermastat is being redone or a new one, not really sue what they do. Costing me $490.00 to get all done.