hi well i just got my trannys switched out two days ago because i blew second gear out of the one that was in there and the one that was in there was an aftermarket BBK transmission and i just put a rebuilt 700r in it and i kept the same torque converter in there and the guy at the shop said i should change it out because he didnt know if the transmission would work wright with that torque conv in there from the bbk the symptoms i have been getting are like when i go from a start and it switches to the next gear it pulls kinda hard and when i get to about 25-30 and let off on the throttle it drop dow to probly 1300 rpm and then i hit the throttle and it kinda like putters and then catches like its having a problem getting up and goin and i know its not the fuel injectors not spraying its somthing wrong with the trans so please some one help.

p.s its automatic.