I think I overheated it. The front center drive broke and I was playing with it 2WD. It was really fast, I think it overheated it is skipping - kind of cogging - over anything above 1/4 throttle. The shrink wrap around one of the capacitors is melted. The melted shrick wrap actually happened months ago, and it was working fine until now. I don't know what smoked is, there was never any smoke. I never took the temp, I just assumed that is the problem when I drove it 2wd.