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i have replaced new intake gasket new bank 1 02 senser and cleaned maf. truck has plenty of power ideals at 900 rpm. but still getting p0171 code im baffeld.
Vehicle: 1998 ford ranger 4.0
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1 Answer

P0171 Fuel trim lean

On Ford there is the upper intake manifold gasket which is the plenum and the lower intake gasket, There is also which gets missed is the brake booster hose, a split there usually gets missed, There also the MAF air duct that can have tear that would also set a lean code condition
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