I just bought a 88 xj 4.0L AW4 Np231 runs good trans wont shift its acting as if the tcu is disconnected. If I manually shift it from 1 to 3 to D on the shifter it shifts pretty good. but if I just put it in D its like its in 3 or OD and wont shift. checked the fuse it was good and has power to it when the ign is on. any ideas where to look? I searched for Tcu threads and couldnt find anything. feel free to link me a thread with the info I might need.