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  1. 2013 spark plugs - Motorcraft/NGK/Brisk? Need some help!

    F150 Ecoboost Performance
    Alright guys, I am running Mike's 91 Perf/Tow tune from 5 Star, and love it. Truck has about 4000 miles, and I feel I am having some spark issues, haven't pulled the plugs yet, but I have heard some crazy gap stories, as well as cracked porcelain, etc. Also, the inside of the tail pipe is full...