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code po340, po146,po102,po300

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i change the spark plugs, wires, oxigen sensor, gas filter,fuel pump, and i still have the same problem on my truck 1997 v6 4.3 engine, have lack on power, waste too much gas, i dont no watt is the problem, please help

Vehicle: 1997 Chevrolet pick up v6 4.3

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