Yours may not have been bad. It just may have been changed by a mechanic that used the "shotgun" approach to fix a problem. In other words, replace everything until it works. It is funny how a dirty connection can look just like a bad component. The difference is the time it takes to clean that connection or replacing a perfectly good component that will cost the customer several hundred dollars. The only way for you to tell is to keep the old parts and then reinstall that TCM after the vehicle is running properly to see if it is really bad.
