Night Crawler Steering causing wheel motor to turn??
 

I have an original night crawler that was collecting dust for some time. I got it out recently and tried getting it working.

I have the throttle forward and reverse working great. But when I steer the wheels it seems to be affecting the forward reverse movement. It's very jerky actually. So if I just turn the steering wheel, it will lunge forward or backwards, seemingly at random. Has anyone experienced this before? Does anyone know why the steering would cause the wheel motor to lunge forward/backward?