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poor running

  1. very high idle

    Today I started my old plow truck to be sure we were ready for incoming. Distracting results. Started it on a tank that had maybe a gallon of very old gas (5) yrs.? Added 5 gallons of gas, put in 1/3 bottle of 103 octane booster, put some Gummout cleaner, & most of a bottle of heet drygas. ran...