They were only installed a few days but so far my misfires are gone. Installed on the F-150 2005, 5.4 liters. Fit well and cured my misfire problem along with changing the spark plugs. No idea how old the original coils are (172,000 miles on the truck) and about 70,000 on the spark plugs. Time will tell how they hold up, but they cost several times less than OEM.
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