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The simple answer to adjust the carb you have is to connect a vacuum gauge to a vacuum port on the intake manafold. Start the engine, let it warm to normal operating temp. adjust the fuel/air mixture screws. You are looking for the highest smoothest reading on the gauge. as you adjust you will want to turn the idel speed to a lower rpm. Anything further, you will need to take the carb to a pro. The smaller the carb the better the fuel mileage but performance will suffer. For a four barrel carb the smaller the primaries the better.
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Carbon
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The most common reason for a engine to miss and lose power is a lack of fuel. A dirty fuel filter can cause an intermittent fuel supply to the engine.
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get a tune up it could be the spark plugs not firing right or clean ur fuel injectors
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