I was blazing thru some mudd pits for a bit. When I stopped and put it into reverse, it stalled. Each time after that it wouldnt go into reverse without stalling. Then it actually jumped forward in reverse. Ata a stand still the speedo started moving back and forth 0mph to 50mph and down, and up and down. Going forward wasnt effected at all. Is this a broken part or just too much mudd on electrical parts?