Is not adjustable but may not be the cable or cable alone.
Gas pedal and other things can be problems or add to a iffy cable problems.
Example: Pedal and plastic part hold to the bracket can wear out or fail completely and make problems. Worse when some id10t used oil/grease to lube plastic parts.
See my Cave, Throttle Cable
Dr. Ian Malcolm: Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should.
The Ogre's Fiero Cave