well yesterday i was driving and i got on it in second and through 3rd also then let off. but when i shifted very slowly to fourth it was still at full throttle and it reved through roof like i have never herd a car before, i had to shut it off doing about 40mph and roll it till it slowly stopped i let it sit for a few mind because it has never done something like that before and when i started it again as soon as it cranked it was on full throttle. so confused? scared to start it and blow it up , help ?