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Did you try a basic tune-up? A misfire is either spark (spark plugs, points, rotor, wires, electronic ignition module, etc.), OR fuel (carb adjustment, dirty fuel injectors, plugged fuel filter, weak fuel pump), OR emissions system failure. You haven't given enough info on the vehicle or symptoms to be more precise.

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Q: What could be the problem if it feels like you're only firing on seven cylinders there's no power and you get terrible gas mileage on your 1986 305ci Chevy truck?
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