It's called a detent cable. It looks identical to the TV cable found on many transmissions but it doesn't have the same operating characteristics. Put the detent cable in the bracket. Pull the tear drop shaped plastic end past the nub on the carb and hook it in. Adjust the cable by depressing the tab to fully release the cable and push the plastic piece towards the firewall. sit in the truck and push the pedal to the metal (engine off of course). that should give you your preliminary adjustment.
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