Ok just like the subject the downshift from stopping is really rough. so rough the car almost stall. First of all I just replace my tranny and change the torque converter to a high stall which is about 2400-2800 stall speed. For a couple of day it didn't happen but know when I come to a stop the tranny downshift then suddenly when it shift down from 2nd to 1st it kicks or jerk the whole car and almost die then back up. But I do notice that when that happens idling is kinda high. Some time when I am stop light the idling goes from 1000-2000 and then back down and then up. Can it be the TPS or the IAC. Planning to change all those when I get the 60mm TB from Modern Performance. Please any help is greatly appreciated.

V