Computer issues maybe?

Codes its throwing are : P0410 & P0742 Im thinking overall it maybe the TCC solenoid because when the car is just started (cold) it runs perfect but after 25 min+ it begins to shift strange but no like a transmission issue. Again it feels more like a broken mount, almost fells as though its going to stall once it******. I dont force more power into accelerating as I dont want it to. Cause further. Issies. So.I try to maintain a steady speed untill the******** goes away, which it does vut while in traffic the stopping and going seems to make it happen once again. Once I shut the car ofd and take the key out, the car runs perfect! And again the same problem.

Also I have a small oil leak im thinking that could be the pcv valve (possibly).

This is what I know just from having a code machine hooked up. Is it possible that these codes are wrong or are they fairly accurate? Ive never been in a situaion where the codes were wrong and it was something other then what the codes say.

I beleive its a TCC solenoide. Has it put on a diagnostic machine today. That was the obly readibg that poped up. But I was told that it wasnt the converter itsself that I was just the sensor. Is that possible? I dont know very mucj about cars except that most buicks share some of the same issues. I dont want to be rebuildong my transmission when its likly that- thats not even the answer. And computer issue? You mean I may have to replace the computer?