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  1. Help me chase a stubborn P0303 (cylinder 3 misfire) code

    Looking for help with a P0303 (cylinder 3 misfire) code on my stock 2016 EcoBoost Premium convertible. First appeared several weeks ago, and as I’d just bought new plugs (NGK iridium, pre-gapped) I went ahead and put those in. Not sure if the Motorcraft plugs that came out were original (got the...


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