Muzzle Flash turning on and off even when not firing

Hey everyone! My muzzle flash and all of the lights in the scene keep on turning off and on even when I am not firing! Can anyone help? BTW This is my Ray Shooting script so far:

 #pragma strict
 
 var Range : float = 1000;
 var Force : float = 1000;
 var Clips : int = 20;
 var BulletPerClip : int = 36;
 var ReloadTime : float = 4.6;
 var BulletsLeft : int = 0;
 var ShootTimer : float = 0;
 var ShootCooler : float = 0.09;
 var Damage : int = 20;
 var HitParticles : ParticleEmitter;
 var muzzleFlash : ParticleEmitter;
 var muzzleCooler : float = 0.9;
 var muzzleFlashTimer : float = 0;
 var MuzzleSpeed : int = 200000;
 var light1 : GameObject;
 var light2 : GameObject;
 var light3 : GameObject;
 
 public var ShootAudio : AudioClip;
 public var ReloadAudio : AudioClip;
 
 function Start () {
     BulletsLeft = BulletPerClip;
     
     muzzleFlash.emit = false;
     HitParticles.emit = false;
 }
 
 function Update () {
     if(muzzleFlashTimer > 0){
         muzzleFlashTimer -= Time.deltaTime;
         MuzzleFlashShow();
     }
     
     if(muzzleFlashTimer < 0){
         muzzleFlashTimer = 0;
     }
 
     if(Input.GetMouseButton(0) && BulletsLeft){
         if(ShootTimer == 0){
             
         PlayShootAudio();
         RayShoot();
         ShootTimer = ShootCooler;
     }}
     
     if(muzzleFlashTimer == 0){
         muzzleFlashTimer = muzzleCooler;
         MuzzleFlashShow();
     }
     
     if(ShootTimer > 0){
         ShootTimer -= Time.deltaTime;
     }
     
     if(ShootTimer < 0){
         ShootTimer = 0;
     }
 }
 
 function MuzzleFlashShow (){
     if(muzzleFlashTimer > 0){
         muzzleFlash.emit = false;
         light1.active = false;
         light2.active = false;
         light3.active = false;
     }
     
     if(muzzleFlashTimer == muzzleCooler){
         muzzleFlash.transform.localRotation = Quaternion.AngleAxis(Random.value * 360 * MuzzleSpeed , Vector3.forward);
         muzzleFlash.emit = true;
         light1.active = true;
         light2.active = true;
         light3.active = true;
     }
 }
 
 function RayShoot () {
 
     var Hit : RaycastHit;
     var DirectionRay = transform.TransformDirection(Vector3.forward);
     
     Debug.DrawRay(transform.position , DirectionRay * Range , Color.red);
     if(Physics.Raycast(transform.position , DirectionRay , Hit, Range)) {
     
         if(Hit.rigidbody) {
         
             if(HitParticles){
                 HitParticles.transform.position = Hit.point;
                 HitParticles.transform.localRotation = Quaternion.FromToRotation(Vector3.forward, Hit.normal);
                 HitParticles.Emit();
             }
             
             Hit.rigidbody.AddForceAtPosition( DirectionRay * Force , Hit.point);
             Hit.collider.SendMessageUpwards("ApplyDamage" , Damage, SendMessageOptions.DontRequireReceiver);
             }
         
     }
     BulletsLeft --;
     if(BulletsLeft < 0){ 
         BulletsLeft = 0;
     }
     
         if(BulletsLeft == 0){
             Reload();
         }
 }
 
 function Reload (){
     PlayReloadAudio();
     yield WaitForSeconds(ReloadTime);
     if(Clips > 0){
         BulletsLeft = BulletPerClip;
     }
 }
 
 function PlayShootAudio () {
     audio.PlayOneShot(ShootAudio);
 }
 
 function PlayReloadAudio () {
     audio.PlayOneShot(ReloadAudio);
 }