I have a 1999 Olds Delta '88 LS. Apparently, the car is double shifting where it jerks very hard when shifting gears. My tranny guy says a code appears P0746. I had him replace the tranny with a remanufactured one from the GM dealer. He claims that it is not the transmission, but the computer. He said he cleared the code and the Service Engine light went out and the car rode fine. However, a few minutes later, the light came back on and it started jerking again. How do I fix this problem?