Kind of new to these things. Not sure how fast it's supposed to go. It moves along pretty quick but if you floor it, it goes dead. I see 2 wires going from the pedal resistor to the controller. Can you check them with an ohm meter?
It didn't go open, just a little higher on the scale. Must be something weird in the controller? Or maybe the resistor needs to be recalibrated ? It seems a little jumpy on the pedal, especially in reverse.