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  1. Bernie

    Maxed out fuel trims for no reason??

    In serious need of help here. I recently bought a 98 sierra with 5.7 vortec at 340xxx km. On a good tank I'll get 200km on a full tank and no more. Occasionally it throws the odd lean code however me nor anyone else is able to figure out why. Upon hooking up a laptop and checking everything out...
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