I never cared for "fly by wire" throttle controls. The gas pedal is a stand alone unit, not mechanically hooked to anything. It relies on a variable resistance sensor to send input to the engine controller, which then opens the throttle blades accordingly with a servo motor.
We're talking a small amount of volts here. .8 volts may signal closed throttle, 4 volts wide open. Just a small bleed over from adjacent wires in the harness and all hell breaks loose.
I asked a Chrysler training instructor about this. Why replace some thing as simple as a throttle cable with all these electronics? Answer-"the electronic throttle saves the cost of a cruse control vacuum servo."
No real reason, just cost cutting.