I have a 2003 Kia Rio with an automatic transmission and 90,000 miles. Never had a problem until today, All of a sudden the transmission slips in and out of gear. I will be driving down the road and the rpms will go up as if in nuetral and then go back into gear. Also when i press on the gas pedal th gear select indicator (P,N,R,D,2,1) lights shut off when i press the pedal but come right back on when i let off the gas pedal or press the brake pedal. The fluid is a good red color and is full and has been serviced by dealer. The CEL is not on and no codes are stored. Alternator is charging at 14.5v even under a load. I am not sure but it seems like either a TCM or maybe the TCM is getting a bad signal from throttle position sensor? I just don't want to put a Transmission in it if I don't have to.