Cost and the necessity to replace the engine control module in my Hyundai accent on 2003 Hyundai Accent

My mechanic replaced my transmission because the codes were coming up on his diagnostics machine. However, the car was still driving rough (slow at accelerating from 1st to 2nd and 3rd to 4th and try to stall but then jerking back into geat). He thought the transmission replacement may have been had so he put in another one and it continued to do the same thing. Now he is mentioning replacing the engine control module. He is usually very honest, however, I have been reading in others areas that this might not be necessary? Please help with this if you can. Also, he is saying the part itself is around $1,000, but I heard mention the part with labor should only be around $1,000. Please input on this if possible, as well. Thanks in advance for ANY help for this frustrated car owner!

by in Las Vegas, NV on September 15, 2012
1 answer 1 comment
ANSWER by on September 15, 2012
did he replash ecm to match r/b trans?
COMMENT by on September 15, 2012
I don't know, but good question so I will ask him. THank you SO MUCH!!!! :) Will keep you posted.