I have a 2000 that I just bought. The trans was allegedly rebuilt 40000 miles ago. I had to rebuild the engine and just did my first test drive. The car gets up to 60 with no problems, no hesitation or shifting issues. When at cruising speed it randomly downshifts for a few seconds then back up. I had a Jeep that did this for a while it turned out to be the TPS anyone know if that's the same here?