It acts like you don’t wanna shift or it doesn’t have the power to allow the car to even go above 45 miles an hour idles fine. It sounds fine until you try to accelerate change the throttle positioning center.
might want to check your fuel system i had the same issue n it comes to find out that the senior to the gas wasn’t reading the tank consumption so the engine wasn’t getting the amount of gas it needed there for i kept losing power