I rebuilt the gears at aamco and have the warranty and all, but the moment the code for the tranny circuit failure went off, I had a code for fuel system too lean bank 2, but it's still giving me downshift or shift stuttering issues. I wasn't expecting this since the tranny was replaced. As it turns out, I ran a can of seafoam thru the gas, and high octane fuel and it would only stutter or down shift once in a blue moon. It was never common.. but I'm thinking either the fuel system is messed up, or the PCM needs to be replaced.. what's your take?