I normally endorse that you take out the torque converter through the transmission to diagnose it adequately. The TP sensor implies the throttle plate angle. If the driving force accelerates to extensive-open throttle, the TCM disengages the TCC to downshift. Direct substitution - this torque converter clutch, or TCC, solenoid https://mylesetcmr.theisblog.com/34195247/not-known-factual-statements-about-torque-converter-clutch