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Danny Fowler

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  1. Danny Fowler
    I bought a 2012 Sierra Z71 in Jan '20. Engine code 7 LC9 5.3 with AFM. I've had to replace spark plugs twice because of misfires. I'm using recommended AC Delco iridium plugs. When the 1st set came out, a couple of the plugs were burnt and cracked. 2nd set, plugs 7 and 8 were burnt, 7 had a lot of oil on it. Truck runs at a consistent 210 degrees. Is this too hot?

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