A faulty seal on the torque converter will result in the transmission fluid to leak out in the torque converter, and so the tension inside the converter will be dropped. When the torque converter is defective, it'd develop unforeseen pressures inside the torque converter, which often can cause rough idling. https://torque-converter-clutch38158.blogpayz.com/34053532/torque-converter-clutch-an-overview