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engine misfire

  1. Focus ST Maintenance
    '13 Focus ST - 80,000 miles. Never replaced the spark plugs. Got a Stratified 93 tune 2 years ago (no bolt ons). Purchased NGK one step colder plugs. Installed them this afternoon. I gapped them to the recommended .026 by Stratified. I torqued them by hand and feel, not with a torque wrench. I...