ORIGINAL: sUrface

Very confused not sure what is wrong. i bough a new spur cause i thought maybe it was stripped which it was. I installed my new one. Went to start my engine up and it was going like full throttle so i messed with idle set screw got it back ot normal started it again went to push gas i saw the servo move but car didnt move alost the engine sounds like it was working but the tires just dont move :/ To much trouble with rc cars.