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Re: rich or lean
Posted to Technical Theory Forum on 5/13/2006

A vac leak + the PCM is subtracting fuel ???

Run th engine at 2000 RPM for 1 min the look at fuel trim. Is it still subtracting. If yes then I would look for an ign misfire, bad O2 or MAP out of range. Perhaps an injector stuch open or FP regulator leaking f... Login to read more.