2000 4.3 bad mileage!?
#12
For fuel trims the closer to 0 the better. Usually with a fuel leak you will see a negetive number in the fuel trim trying to compensate for extra fuel. I belive it sets a code after it reaches +/- 15. The fuel leak down described it a very minor one. But maybe something is caught early. Will be easy to tell once the upper intake is off. Would suggest Delco plugs, might just be my personal opinion.
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