So i currently purchased a used HPI Rs4 Evo nitro car off ebay... got it the other day.. went out with a friend and got it running. brakes didnt seem to be working right.. started to look at my friends and compare them cuz hes got the same car... there are 2 metal plates on each side of the little round part there.. well the kid had the 2 plates together .. anyways.. i took it all part switched it around but when i started the car back up without giving it any gas at all its just blasting WOT and i gotta turn it off or ill blow up lol. How did that happen and how can I fix it.. I'm new to all this so my lingo isnt the best lol little round thing..