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P0304 Volkswagen

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My 2001 jetta is giving me two codes po304 and pk301 and I also get a error with my ECT not grounded , I replaced the temp senser, spark plugs,fuel pump. still unknown adout why im getting misfire on 2 and 4 cycl.

Vehicle: 2001 voltswagon , 2.0

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Ignition coils  if you have a misfire on number 2 cylinder and number 4 is affected this is a short ignition coil pack,

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