Why wont my particle emitter work? It won't show up for some reason.

I'm making a dragon game where you press a button to breathe fire and my particle emitter isn't working. Please help!

Here's a sample of my LocalScript in StarterGui

local colorone = Color3.new(255,95,2)
local colortwo = Color3.new(255,255,255)

print("Start of Script")
local fireBreath = Instance.new("ParticleEmitter",game.StarterPlayer.StarterCharacter.Mouth)
fireBreath.Color = ColorSequence.new(colorone,colortwo)
fireBreath.Lifetime = NumberRange.new(10,10)
fireBreath.Rate = 500
fireBreath.Speed = NumberRange.new(60,60)
fireBreath.SpreadAngle = Vector2.new(20,20)
fireBreath.Texture = "rbxassetid://178636145"
fireBreath.EmissionDirection = 5
fireBreath.LockedToPart = true
fireBreath.Enabled = true

game:GetService("UserInputService").InputBegan:connect(function(input,gameprocessed)
    if input.KeyCode==Enum.KeyCode.LeftShift then
        for i = 1,16 do
            wait()
            fireBreath.Enabled = true
        end
    end
end)

game:GetService("UserInputService").InputEnded:connect(function(input,gameprocessed)
    if input.KeyCode==Enum.KeyCode.LeftShift then
        for i = 1,16 do
            fireBreath.Enabled = false
        end
    end
end)