Did you get the correct plugs, and if so, what brand? Some are useless. The best plug is the German plug made by Beru. If you buy from Ford as Motorcraft, it will be the Beru in a Motorcraft ZD1A box for pre 1987 6.9s. If an 87 6.9 it takes a Motorcraft ZD9.
If you bought Champion, Delco, Autolite, or Wellman WAP, you might as well throw your money away. They tend to burn out fast under normal use.
1983 to 1986 6.9s take totally different plugs then then 1987 6.9s.
1983 to 1986 6.9s take:
Delco 8G, Beru 0 100 271 102 or 835MJ or GV835, Bosch 80024, Autolite 1107, Wellman GO80 or dual coil GO88, Champion CH80, Ford and Motorcraft ZD1A or E5TZ12A342B, General Motors 5613680, IH/Navistar - 1804211C2, Lucas/Delphi DS090A, Delphi HDS305.
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Today's Featured Article - Show Coverage: Godfrey, Illinois Country Days - by Cindy Ladage. Except for last fourth of July's Old Gold show in Springfield, Illinois, I don't remember when it was so hot. Nevertheless, the heat didn't keep vendors and visitors alike from enjoying the third annual Country Day's Event. Jane Elliott said the event was originally a one man show. "Barry Seiler, owner of Country Town Farm Supply store used to invite people up to the Johne Deere store. He would give hats and a free meal for everyone that brings a tractor." Elliott said while this
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