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Where should I start to fix my 2004 VW Jetta? It is throwing codes, P0101, P0301, and P1277

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I'm not sure where to start when fixing and engine problem with my 2004 VW Jetta. It is throwing the codes of P0101, P0301, and P1277. Would I start by changing spark plug #1 and putting on a new mass air flow sensor?
Vehicle: 2004 Volkswagen Jetta, 2.0, 4 cylinder

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