Tilt an object with arrowkeys

Is it possible to tilt my vehicle tilt and then restore the position? This is the code I got so far, try to edit it please. static var selectedId : int; static var speed : int = 90;

 function Update () {
     if (selectedId==GetInstanceID()) {
        if (Input.GetKey (KeyCode.UpArrow)) transform.Translate (Vector3(0,0,1) * Time.deltaTime*speed);
        if (Input.GetKey (KeyCode.DownArrow)) transform.Translate (Vector3(0,0,-1) * Time.deltaTime*speed);
        if (Input.GetKey (KeyCode.Space)) transform.Translate (Vector3(0,1,0) * Time.deltaTime*speed);
        if (Input.GetKey (KeyCode.LeftControl)) transform.Translate (Vector3(0,-1,0) * Time.deltaTime*speed);
         if (Input.GetKey(KeyCode.RightArrow))
     transform.Rotate(Vector3.up * speed * Time.deltaTime);
  
  if (Input.GetKey(KeyCode.LeftArrow))
     transform.Rotate(-Vector3.up * speed * Time.deltaTime);
  
 }
     }
 function OnMouseDown () {
     selectedId = GetInstanceID();
 }