Pete, I have a hunch that your problem may be a bad transmission computer governor. While you are having problems coming back up to speed, your transmission may be stuck in 2nd gear. The next time this happens, check to see if your engine is revving. Also try to become conscious of how many times you feel the transmission shift while you come up to speed from a full stop. The most common symptoms of a bad CG is that it will start you off in 2nd gear, so I suggest not trying those 0-60 tests until you are certain of what your transmission is doing. Walt Tampa, FL