I have a 92SC300 auto transmission. I was at a stop and my RPM's suddenly started rising rapidly. I had to put the car into neutral and turn the key off. When I restarted, the car was fine. Also, over the last month, the overdrive twice didnt want to kick in at around 40-45 mph. Stayed in third gear. However, when I turned the car off and restarted, everything was fine again. A mechanic looked at the car and said he wasnt sure but it may be computer related. Does anybody have a similar experience or know what is taking place?? Thanks.