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this is a 2006 ford ranger 4.0 auto. running a eaton m90 supercharger at 3.5 lb.s of boost. ecm is showing a p0171 and p0174 but short term fuel is at .85 and long term is at 1.2 ? no vacuum leaks. if i introduce a vacuum leak fuel trim dose not change ? i was running this combo for a few months...

anyone done this conversion? the W trans has a lower 1st gear than the E so better launch without sacrificing freeway mileage ? doing this on a 06 2 wheel ranger with 4.0