
Works great on my 2012 Yukon Denali. OEM. Straight fit, just make sure yours is round and not square. There was an uneven idle and small jerks in the revs. Removed code, bug. I had 112.xxx miles so it was time. These OEM spools have been replaced with ACDelco OEM iridium plugs and ACDelco Pro OEM wires. Immediately smoothed out the idle. Unleashed some horsepower and got almost 2mpg. All done in about an hour and a half.

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