The torque converter clutch solenoid is often energised (stuck on) which translates to the torque converter currently being constantly locked. In the event the torque converter is defective, it would make unforeseen pressures In the torque converter, which may result in rough idling. This automatic transmission torque converter clutch (TCC) https://zionccyur.answerblogs.com/34194681/5-simple-techniques-for-torque-converter-clutch