I discovered that I am unable to get my codes read. Went to AutoZone and the scanner wouldn't work. My friend had the same model...didn't work either. Is my car too old? What's going on? Error code both times. Also, I've noticed that when at a stop, in drive or in park, when I press down on the brake pedal the rpms drop and the car begins to buck forwards and back. The car has been engaging overdrive, but last night it again failed to work coming home after driving for a few hours delivering. I hope this new info brings me closer to some kind of answer.