Actionscript 2 sound help!

Hi, i am trying to make a car game where you can pick up stuff. Why you pick up an item i want it to sound, and it dose. But the problem for me is, when i put an other sound on the car, you will only hear the car, as long as you are driving. When i don’t press my “UP” key and the car only glide in to the item, i can hear it. But not both.

onClipEvent (enterFrame){
    if(_root.car1.hitTest(this)){
                var coin:Sound = new Sound();
        coin.attachSound("COIN");
        coin.start();
        _root.score++;
        unloadMovie(this)
        }
    }

That’s the script i use on the coin.

onClipEvent(enterFrame){
    if(Key.isDown(Key.UP)){
        var UP:Sound = new Sound();
        UP.attachSound("up");
        UP.start();
        }
        if(Key.isDown(Key.DOWN)){
        var DOWN:Sound = new Sound();
        DOWN.attachSound("down");
        DOWN.start();
        }
    }

and that’s the script i use on the car.

I think i have something to do with the script i put on the car, when i press my up key flash plays alot of that sound and not just 1 as i want it to.

Thx