well that's good it means you have an aod pop the hood there is a little black cover overtop of the throttlebody that makes it so you can't see the cables that control the throttle body, there is a cable that is black and has a spring on it, this is the tv cable that sets the line pressure on the transmission it is possible that the adjustment clip somehow broke and the trans is running full line pressure all of the time...don't mess with this cable if you don't think it's broken because it can ruin your trans if you don't know how to adjust it and it's pretty hard to adjust right...i would check that and i would change the fluids in the trans and put on a new filter