Speed control sencor on 2000 Chrysler 300M

I recently had my ECM replaced. After that my car started to get stuck in 2nd gear an my ingine light came on. I had it scanned at Auto Zone an it read P700. So i had my speed control sencors replaced(input and output)Then it drive fine until i tried to use my autostick. the inine light came back on an got stuck in 1st gear... what could be my problem?

Asked by for the 2000 Chrysler 300M
Have you had the codes rechecked since the engine light came back on?