OK that is the bowden cable. There is an O ring that needs to be replaced. The bowden cable is released by twisting it CCW I believe as viewed from the top. It turns about 30 degrees or so just enuf to clear the capture mechanism. You also have to press the plastic to alow it to turn. Then the fun begins.
I will be easier if you remove the transmission pan to help in getting it disconnected . There is a small metal rod that slips into a hole on the end of the cable. You will probably have to disconnect the other end of the bowden cable at the accelerator end so that you have maximum length to work with. It is very difficult to describe how to disconnect it. But you need to allow the cable to be pulled out the botton as far as possible to expose the link that connects to the metal rod in the transmission. The metal rod is spring loaded and will want to go inside the transmission. With the pan off, you can force the metal rod to stay stationary.
When things are right, simply unhook the metal rod from the cable. Replace the O ring and reassemble.
I got too many cars!! Insurance eats me alive. Dave
78 Corvette Stingray - 3k
82 242 Turbo Volvo - Manual - 270k
86 300e 5 speed manual - 210k
87 420sel - 240k
89 560sl - 78k
91 420sel - 205k
91 560sel - 85k
94 GMC Suburban - 90k
97 Harley Davidson Heritage Softail - 25k
00 GMC Silverado 1 ton 30k