Acceleration pedal

Fix what you have. If it is all mechanical linkage going to a cable has some advantages but is a lot more work.

 

If you've got mechanical linkage it'd be much simpler to fix what you have. Converting from mechanical to electronic is going to be more of a PITA than it's worth by the time you find an actuator for the pedal to control and custom build all the brackets and wiring to fit the actuator onto the pump.

 

Sticky foot feed, eh? Probably gunk and cow$#ite at the bottom hinge of the pedal. Never cared for electronic throttle, never seemed to have the feel of a manual linkage one. Is it one of those big wide throttle pedals? Always liked those.