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2008 gmc fuel mileage droping

Bill Foster
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Bill Foster New Member

Bill Foster

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ok my 2008 used to get 16.3 mileage on the average now its down to 14.7   .put on scanner it reads something different every time using a snap on top of line scanner said all plugs misfiring then the next time low fuel pressure any Ideas.  put new fuel press sensor plugs help im old school mechanic

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