These plugs fixed cylinder 5 misfire under hard acceleration. I have a 2012 Ecoboost Crew Cab and after 50,000 miles it started misfiring after 5. After reading many F150 forums, OEM plugs were a common problem. After work I opened the hood, unscrewed the old spark plugs and put in these new ones. Candles on the 5th and 6th cylinders were carbonated, and the electrode on the 5th was very worn, four thousand more than on the 1st row. Truck tested on the freeway at 60mph then floored the accelerator - had no misfires and in the 3 months that these new spark plugs were fitted there have been none.
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