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p300 code? rough idle

  1. 2004 9-3 2.0t p300 random misfire code?

    9-3 Sedan, Cabrio '04+, Combi, 9-3X Workshop
    I am getting random misfire code after replacing the timing chain and guides in my 2.0t, runs awesome with good boost it just throws the p300 code now. It has a verry slight stutter on cold idle. Can't see variation in rpm at all. Runs great and smooth so I'm not really sure why its throwing a...