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How do I fix code p0301?

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i have an 1997 Buick Le saber limited custom P0301 code new spark plug and wires new coil packs new O2 sensor full injector new catacly cover done still restest show P0301

Vehicle: 1997 buick le sabre limited custom 3.8L

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Is the engine running rough? if it is running rough then the next step is to perform a compression test.

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