HEY

about a month ago i bought a 2000 grand prix gtp with 191k on it for 500 bucks with a bad torque converter( well the owner thinks)
before i put 300+ dollars into replacing the torque converter i wanna make sure that is the problem...When i took it to get scanned two codes popped up.
1.the torque converter code
2. the torque converter solenoid code

btw..when the car is cold from first start up it runs but after 2 min of driving it feels like the transmission is locking up( as if you are at idle and just pushing the pedal)

please help!! anyone ever had this problem?

oh also at idle it makes a loud noise.