Read something pointing out that the idle control valve could cause the fast idle when cold, but would it be able to also cause misfires? Also what about the map sensor? Should that be a place to look?
One more thing, I bought 6 spark plugs from Champion, platinum ones and they have a 0.8mm electrode gap. Is that fine for a KV6? Haynes says 1mm but I've read some shortened the gap to 0.5mm and it supposedly cured their slight misfiring issues, and not only for one of them, read a lot of cases, what do you guys think?
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