Best spark plugs for a stock 05 yukon 5.3

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iamdub

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Exact replacement AC Delco or NGK. There is NOTHING to be gained with the multi-tipped, split, and/or megasuperultrapaladitanium-tipped gimmick plugs.
 

retiredsparky

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Sometimes the fancy plugs can cause engines to run very poorly. The factory engineers did not use them to design these engines!
 

Bigmac18

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Ive had good success with NGK stock replacement plugs in the past on my other cars. But stick with stock replacements for a stock engine. Like retiredsparky said, they are engineered for these types of plugs
 

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