Have an 04 RR that just started doing some strange shifting. the car travelling at highway speeds will either all of a sudden shift to a lower gear as if to pass then refuse to shift down again unless the rpms go very high. when you slow down it changes gears into lower gears but only shifts again when the rpms go high and will not go any further than 4th. There are no malfunction lights or anything. The only thing that stops it is pulling to astop and switching car off; also removing all the transmission fuses and replacing them restores normal shifting. Engine temp gauge is normal.. what is going on. The indy mechanic pulled the pan and said the fluid was not even dirty, car has 77k miles and I have owned it for 6 years. obd scan at indy showed some fuel sensor code. Any helpful advice besides buy a toyota (just kidding).