Just replaced batteries in car yesterday, and charged the batteries in the controller also. It is a single needle slide carb. Everything seems to be working good. Could possibly be a brake problem I dunno. It works both with throttle and brake so I don't think it is the servo...I dunno. I will try the idle screw today make sure the needle doesnt get stuck on that. After I try that I have nothing else to try except for brakes.

If I turn it on it runs fine...nothing wrong when I turn it on. Its the fact that when I apply medium to full throttle it sticks in full. I guess I will see what is wrong today. I don't feel like taking it apart again lol.