can i ever get better gas mileage
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1987 ford e-350 class c motorhome 27'runs great in park rev all the way like a top.get up to about 30-35mph starts to bogs down and if i give it more throttle it will bogs to the point of backfire.i have changed fuel filter,fuel,rebuilt carb,treat fuel ?
changed fuel filter,fuel added misery oil to fuel,rebuilt holly four barrel 650 cfm,has secondary...