If the LT Fuel Trims comedown at 2500 rpm, you have a vacuum leak affecting bank 1 (right side) Check the hose leading from the intake manifold to the valve cover pcv valve. Usually at the rear of the intake, in back of the throttle body. If thats ok, check all vacuum hoses.
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1968 Firebird 400 RAII M21, 3.31 12 bolt, Mayfair Maize.
1977 Trans Am W72 400, TH350, 3.23 T Top
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