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Spark plug gap

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  • Spark plug gap

    I'm looking for advice before I post my logs. (I have a log though)
    2015 Kia Optima Sxl
    I had installed hks m45xl plugs as it seems to be the norm for optimas and tuning them.
    I have seen most people gap them @.028
    I've also seen a few posts here stating to gap plugs @.022
    I gapped them @.023 but since the cold weather....I've been having misfires until the engine starts to warm.
    Should I go one step hotter with the hks m40xl?
    Are these good plugs for this tune?
    What should I gap them at?
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