Thank Steve for his comments. I found the answer. The gears or clutch were not hanging up. My son had put on the emergency brakes, and they kept sticking on. It had hung up, and it took a mechanic friend to come by and let us know. Be aware though that the older models can do this. It's running fine again.
Steve Says,
I'm so glad you got this fixed! Thanks for posting it! This is not the answer that I expected but I'm glad it was simple and you figured it out.
