This thread is 7 years old... But... The adjustment on the throttle cable is used to adjust throttle lever free play ONLY. Throttle lever free play should be around 1/16" - 1/8" play before the cable starts to move. It should NOT to be used to adjust idle speed.
If you have an EFI machine idling too fast check for air leaks in the intake boot.
Idle speed/TPS adjustments should only be done on EFI machines using specialized tools and knowledge by a qualified technician... and many dealer techs don't know how lol.