Can someone help me with this combined sprint (shift and double tap w) script?

I tried to combine minecraft sprint script and shift sprint script but there's a problem. It screws up my walkspeed and the camera's field of view when i did both double tapping w and holding shift and release w before releasing shift.

I've removed the animations the script gave me, renamed the variables and added more conditions to separate both functions but it doesn't seem to work.

It'l be nice if someone can fix it.

And here's the script:

local mouse = game.Players.LocalPlayer:GetMouse()
local wrunning = false
local shiftrunning = false
local s = ""

mouse.KeyDown:connect(function (key)
	key = string.lower(key)
	if (key == "w" or key == "") and string.byte(key) ~= 48 then
		s = s.."w"
		delay(0.2,function ()
			if s ~= "ww" then
				s = ""
			end
		end)
		if s == "ww" then
			s = ""
			wrunning = true
			local wkeyConnection = mouse.KeyUp:connect(function (key)
				if key == "w" or key == "" then
					wrunning = false
				end
			end)
			local fov = game.Workspace.CurrentCamera.FieldOfView
			for i = 1,5 do
				game.Workspace.CurrentCamera.FieldOfView = (fov+(i*2))
				wait()
			end
			local walkspeed = game.Players.LocalPlayer.Character.Humanoid.WalkSpeed
			game.Players.LocalPlayer.Character.Humanoid.WalkSpeed = walkspeed +8
			repeat wait () until wrunning == false
			wkeyConnection:disconnect()
			game.Players.LocalPlayer.Character.Humanoid.WalkSpeed = walkspeed
			for i = 1,5 do
				game.Workspace.CurrentCamera.FieldOfView = (fov+10-(i*2))
				wait()
			end
		end
	end
	if string.byte(key) == 48 and key ~= "w" then
		shiftrunning = true
		local shiftkeyConnection = mouse.KeyUp:connect(function (key)
			if string.byte(key) == 48 then
				shiftrunning = false
			end
		end)
		local fov = game.Workspace.CurrentCamera.FieldOfView
		for i = 1,5 do
			game.Workspace.CurrentCamera.FieldOfView = (fov+(i*2))
			wait()
		end
		local walkspeed = game.Players.LocalPlayer.Character.Humanoid.WalkSpeed
		game.Players.LocalPlayer.Character.Humanoid.WalkSpeed = walkspeed + 8
		repeat wait () until shiftrunning == false
		shiftkeyConnection:disconnect()
		game.Players.LocalPlayer.Character.Humanoid.WalkSpeed = walkspeed
		for i = 1,5 do
			game.Workspace.CurrentCamera.FieldOfView = (fov+10-(i*2))
			wait()
		end
	end
end)

Thanks.

Try this.

local mouse = game.Players.LocalPlayer:GetMouse()
local wrunning = false
local shiftrunning = false
local runningSetUp = false
local s = ""

local fovIncrease = 10
local walkspeedIncrease = 8

local toggleDebounce = false
function toggleRunning()
	if toggleDebounce then return end
	toggleDebounce = true
	if wrunning or shiftrunning then
		if runningSetUp then return end
	    game.Workspace.CurrentCamera.FieldOfView = game.Workspace.CurrentCamera.FieldOfView + fovIncrease
	    game.Players.LocalPlayer.Character.Humanoid.WalkSpeed = game.Players.LocalPlayer.Character.Humanoid.WalkSpeed + walkspeedIncrease
	    runningSetUp = true
	else
		if not runningSetUp then return end
	    game.Workspace.CurrentCamera.FieldOfView = game.Workspace.CurrentCamera.FieldOfView - fovIncrease
	    game.Players.LocalPlayer.Character.Humanoid.WalkSpeed = game.Players.LocalPlayer.Character.Humanoid.WalkSpeed - walkspeedIncrease
	    runningSetUp = false
	end
    toggleDebounce = false
end

mouse.KeyDown:connect(function (key)
    key = string.lower(key)
    if (key == "w" or key == "") and string.byte(key) ~= 48 then
        s = s.."w"
        delay(0.2,function ()
            if s ~= "ww" then
                s = ""
            end
        end)
        if s == "ww" then
            s = ""
            wrunning = true
            local wkeyConnection
            wkeyConnection = mouse.KeyUp:connect(function (key)
                if key == "w" or key == "" then
                    wrunning = false
                    wkeyConnection:disconnect()
                    toggleRunning()
                end
            end)
        end
    end
    if string.byte(key) == 48 and key ~= "w" then
        shiftrunning = true
        local shiftkeyConnection = mouse.KeyUp:connect(function (key)
            if string.byte(key) == 48 then
                shiftrunning = false
            end
        end)
    end
    toggleRunning()
end)