3d car movement problem

programming
1

I have a great problem with my 3d car racing game. in attachment there are a car image with 36 frames and the movement of car that i want.

My code dont work:


onClipEvent (load) {
    //_rotation = 90;
    var rot:Number = 270;
    var speed:Number = 0;
    var setSpeed:Number = maxSpeed;
    var acc:Number = .1;
    var setAcc:Number = acc;
    var maxNos:Number = 500;
    var nos:Number = maxNos;
    var slow:Number = .98;
    var brake:Number = .9;
    var rotazione:Number = 0;
    var rrot=0;    
}

onClipEvent (enterFrame) {
    
    _x += x;
    _y += y;
    
    rot = (speed/2)+1;
    if (Key.isDown(Key.RIGHT)) {
        //_rotation += rot;
        rrot+= rot;
        trace(rrot);
        rotazione += 100;
        quanto=rotazione/10;
        ruota(quanto);
        if(quanto>=360)rrot=0;
    } else if (Key.isDown(Key.LEFT)) {
        ///_rotation -= rot;
        rrot-= rot;
        trace(rrot);
        rotazione -= 100;
        quanto=rotazione/10;
        ruota(quanto);
        if(quanto>=360)rrot=0;
    }
    if (Key.isDown(Key.UP)) {
        speed += acc;    
    } else if (Key.isDown(Key.DOWN)) {
        speed *= brake;
    } else {
        speed *= slow;
    }
    
    r=-rrot*10;
    trace(r);
    rad = r * Math.PI/180;
    
    x = Math.sin(rad)*speed;
    y = Math.cos(rad)*speed;
    

function ruota(dove){
    dove=Math.round(dove)/10;
    dove=Math.ceil(dove);
    //per valori negativi
    if(dove==-17)_root.car.gotoAndStop(19);
    if(dove==-16)_root.car.gotoAndStop(20);
    if(dove==-15)_root.car.gotoAndStop(21);
    if(dove==-14)_root.car.gotoAndStop(22);
    if(dove==-13)_root.car.gotoAndStop(23);
    if(dove==-12)_root.car.gotoAndStop(24);
    if(dove==-11)_root.car.gotoAndStop(25);
    if(dove==-10)_root.car.gotoAndStop(26);
    if(dove==-9)_root.car.gotoAndStop(27);
    if(dove==-8)_root.car.gotoAndStop(28);
    if(dove==-7)_root.car.gotoAndStop(29);
    if(dove==-6)_root.car.gotoAndStop(30);
    if(dove==-5)_root.car.gotoAndStop(31);
    if(dove==-4)_root.car.gotoAndStop(32);
    if(dove==-3)_root.car.gotoAndStop(33);
    if(dove==-3)_root.car.gotoAndStop(34);
    if(dove==-2)_root.car.gotoAndStop(35);
    if(dove==-1)_root.car.gotoAndStop(36);
    //posisizione
    _root.car.gotoAndStop(dove);
    }
}