How to pause run service when a value becomes false?

local script: when the left arrow key is pressed a bool value is set to true and is set back to false when it is released

-- The local script--
local uis = game:GetService("UserInputService")
local sm = game.Workspace.valfolder.shootmain --bool val
uis.InputBegan:Connect(function(input)
		if input.KeyCode==Enum.KeyCode.Left then
		print("Then left pressed")
		sm.Value = true
			game.ReplicatedStorage.fireshot:FireServer()
	end
end)

uis.InputEnded:Connect(function(input)
	if input.KeyCode==Enum.KeyCode.Left then
		sm.Value = false
			print("left arrow remote event start")
	end
end)

server script: when the value becomes true, the RunService begins but the issue occurs when the value is set to false it does not stop.

local sm = game.Workspace.valfolder.shootmain --bool val
local runService = game:GetService('RunService')
local Stepped 
game.ReplicatedStorage.fireshot.OnServerEvent:Connect(function(player)
Stepped = runService.Stepped:Connect(function()
	if sm.Value == false then
		print('Printing')
if sm.Value == true then
wait(.5)
Stepped:Disconnect()
			end
		end
	end)
end)

ps. how can I add a wait in the RunService so the print has a wait?