Recently my check engine light has come on. I brought it to a local auto shop and hooked up the diagnostics computer to the car. Four codes came up saying to lean. The only mods as far as the engine goes are intake and exhaust. Would this be the cause? Could it be the O2 sensors? Car as roughly 47000 miles on it. Also, my tranny is shifting very sparatically, tranny fluid is black and definitely needs to be changed. If the tranny prob turns out to be serious, does anyone know where I can find a used E-Shift tranny? Any help would be appretiated!!