At around 70 MPH under load like climbing a hill the transmission doesn't disenage the TCC as the throttle gets to 25%. If you press the throttle further, transmission will shutter (feels like the TCC finally disengages) followed by an immediate and harsh downshift into 3rd. At that point, the vehicle will continue to have harsh and delayed downshifts under load. Shutting off the car and restarting allows the transmission to smoothly operate the TCC without the harsh downshifting.
I can't really determine if the transmission is behaving this way because of a performance problem with the engine or the transmission is having issues. Some days the car is beast and other days, it drives like a tank. With the misfire or a max shift adapt I would expect a DTC. But have none.
