Hey guys I just got my 1993 celica sx and there is an electrical problem, when I hit a bump or back off the throttle the speedo and other dial fly up and down and it sounds like the ignition is turning on and off really quick, the car wants to die when this happens and if I accelerate when it's doing it it doesn't go and backfires, it happens ever time I hit a bump, back off or change gears, Thanks for any help guys