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  1. Idle AFR Fluctuations

    Evo X Tuning
    So I am having an odd idle (and cruise) issue, where my AFRs will fluctuate very rapidly. Here are the main details: Fresh head rebuild. I am only 400 miles on it so far. New intake valves, it has gsc s2 cams and beehive springs I am tuning with Christian Muna at Pure Drive Performance in...