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Seems to me that you are trying to much octane for your plugs therefore your jusst fowling out them which will make hesitation and misfiring. Have learned that by doing the same thing. Try running 87 octane a while just might clean itself out.

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14y ago
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Q: You put one gallon of 110 octane in with three quarters of a tank of 91 octane and now the car feels sluggish and misfiring?
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