Sticky throttle when hot - solution:
You do not need a new cable you need new cable routing. The solution is so simple I could not figure it out for nearly 2 years. You can't have any sharp turns in the throttle cable. If you route the cable so that all the turns are smooth large radius circle turns the cable will move smoothly and your throttle body and gas pedal return spring will be strong enough to close the throttle completely no matter how hot it is in the engine compartment.
Look at the second picture in this
thread. Notice how the throttle cable comes straight out from the firewall and then slowly loops back around to the throttle body. This is ideal routing that leaves no chance that the cable will bind inside the cable housing.
Step back - symptom restated:
The symptom is a high or surging idle when the engine is warm. This is worse when it is warm outside and under hood temps are at their highest. For me this only happened on hot days. You can often get the normal idle speed back by either lifting the gas pedal with your foot or revving the engine (essentially snapping the throttle open and shut). If you stop and open the hood when you are getting the high idle you should be able to force the throttle plate closed by hand and the engine should then idle at around 700 rpm. Sometimes you'll get a hunting or surging idle that will stop as soon as the throttle plate is completely closed.
This problem is never from a too loose or too long throttle cable. In fact, there should be a little slack in the cable when the throttle body is closed. If you confirm the throttle plate is completely closed and your idle surges or is too high then its back to the basics of TPS setting and idle screw adjustment, checking for air in coolant, etc.
Why does this happen?
Lots of people including me have an engine swap and routed the throttle cable so it makes a sharp right turn immediately after coming through the firewall and then another sharp turn somewhere on the right side of the engine bay to redirect the cable back to the throttle body. Metal expands when it gets hot and we forget that the throttle cable housing is metal. When hot the cable housing grows longer and reduces the available slack for the cable. The tight turns combine to increase friction for the cable to move inside the housing. The result is that the gas pedal and throttle body return springs are no longer strong enough to pull the cable and completely shut the throttle body. It doesn't help that we have 20+ year old throttle cables, gas pedal springs and throttle body springs.
The stuff they give you with your camera is nothing more than eye candy.. sometimes its cool and usefull but you dont "Need" it by any means 
for those that have found a fix/remedy for this.
