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Evening all just got my kit from psi ,put it the new plugs at 0.40 gap but engine running a bit lumpy on idle? General driving is great don't notice a miss fire? Pulls so much better defiantly feels smoother just lumpy on idle any answers? Wrong gap?
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.40 mm? i presume? If so thats only .0157" surely that cant be the right gap, i would of thought between .028" and .032"
Or in metric .71mm-81mm would be more suited.
 

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