It sounds like the little car is running badly.....The reason for this is because of the revolution limiter.....it keeps the R.P.M. from going too high and blowing up the engine.........
Note at the very end, the sparks coming from the rear wheel rims as the tires burn down .
http://www.youtube.com/watch_popup?v=4TshFWSsrn8&vq=medium#t=35
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