Hi,
Can you operate the TB freely by hand...any glitches then? If so, check the cruise control cable for kinks. When you operate the normal throttle the cruise cable attach point slides along it's cable. If there is a kink in the CC cable it might cause a glitch. Check also the TB return springs for binding. If the TB does operate freely by hand, go inside and check for any obstructions under the dash...hanging wires, sound proofing material, carpet, etc. If nothing there check the throttle cable by holding the TB WFO and remove the cable from the cable guide drum. The cable on mine will easily allow the pedal to fall to the floor when released. If yours doesn't, you might need to un-kink, lube, or replace the cable. A remote possibility might be the TPS or the TB shaft might have a dirty bearing/seal. Remember, "The first thing to go wrong is the last thing you fixed" That's always my troubleshooting motto!
...Ed