Normal idle when cold or warm. High idle when hot after driving

[girraffe]

So I have an issue where my truck runs fine when cool and after a few minutes of driving but anything longer than say 10 minutes the engine wants to run at very high idle at all times. Almost 2000 rpm. Anyone had this issue before?

 

[jonheld]

So I have an issue where my truck runs fine when cool and after a few minutes of driving but anything longer than say 10 minutes the engine wants to run at very high idle at all times. Almost 2000 rpm. Anyone had this issue before?

Throttle cable binding?
When in the high idle condition, can you manually close the throttle?

 

[ajax1]

Sounds like above throttle cable sticking. When it happens put your foot under the pedal and lift up see if Rpms come down