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On my 2004 Hyundai GX350, I Had P0300, P0301, P0303, and P0305 codes, what could be the problem?

Vehicle: 2004 Hyundai GX350

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The codes means that the cylinders are misfiring, and there are many things that can cause that problem. Spark plugs, injectors, cylinder head gasket, oil level, etc. You should start by performing an engine tune-up.

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