Thought they were good spark plugs but the misfire started about 2 months ago (10 months fitment). Coil replaced as these plug leads were not old and had less than 7,000 miles on them. Finally figured it out with 8 leaping fires on the collector. No visible marks or bad spots on the wire and heat shield. Bought several wires of higher quality, as in the old saying: cried once. Saving money and buying good ones is not possible.
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