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this truck is running a 87octane sct tune in winter weather it will has some preignition/ popping noise on wot. it doesnt always do it when it does it its only right on the throttle snap and goes away. puffs black smoke when it does it . i currently have it running a milder tune cause i dont want any sort of knock/preignition. what should i adjust on this sct tune to elininate this issueAttachment 142075
Sounds like it's just blowing out the spark... Try a step colder plug and tighten up the gap a bit.
ok thanks alot for reply. ill try that. whats the best plug to throw in? currently have oem plugs with 20,000 miles on them
Not sure about best plug, as long as they aren't Autolite. lol
I've always been a fan of NGK, LTR71X-II.
Since you only have 30k on the factory plugs, I would just try closing up the gap to .028" or .026" and see if things improve... If not, then maybe look into other changes.