hey guys need your help, i had a search but couldn't find anything on the problem i'm having. after owning my first rex for about a week now, still having a lot of fun with it , i've encountered a problem which has occured twice now. Basically, i've put my foot down in third, all good till about 4,500 revs and it gave me quite a violent jerk, scared the crap out of me lol, any help would be appreciated, thanks guys
edit: sorry forgot to metion the car is stock other than exhaust