GM p/n is 25508262 for your cable you seek. It's called a Throttle Valve Cable, or TV Cable for short. It is NOT a kickdown cable as mentioned.
Aftermarket equivalents seem to show ATP's Y-314 and CA-1937. So it appears you're on the right track. But then you have to adjust it correctly. What's fun is hooking it in the transmission attachment. You can do it without pulling the pan, but it's another one of those if you want to do it absolutely textbook right, you'll have to check the Throttle Valve in the transmission and ensure it's in the right position...blah blah.
EDIT: Oh, and be gentle with the hold down bolt on the transmission end. DON'T cross thread/strip the hole as it's directly into the case. The seal is GM p/n 25518260 if you need a new seal down there.
Here's the adjustment procedure for your new cable. ENSURE you only use the throttle by hand doing this and not the gas pedal from inside the car...