Ok to start it's a 87 LT Camaro with a 700R4. Was going down the interstate and it did as if OD was just gone, so I pulled off at an exit. The car ran fine in drive but from a stop it would run up real high rpm and shift really hard and if i slowed down to about 20mph it would downshift to 2nd hard. I stopped and checked fluid and detent cable (everything was fine) started it up and it did fine including running in OD for about 20 miles then it started it all over again so i drove it home in drive. Then this morning it seems to be doing fine. Could the computer be going bad...anyone had this happen before that could tell me whats going on or have any suggestions? PLEASE HELP! Thanks.