The TV cable should pull out and return smoothly with the engine running or not.
It may be a cable problem or you may have an internal problem with the TV assembly inside the valve body.. If there is excessive wear in the TV bore , the valve can be hydraulically applied and held in the "full" applied position..
Have you checked the governor plastic gear yet?
Some people are like Slinkies... Not really good for anything, but they still bring a smile to your face when you push them down a flight of stairs.