2D custom player movement Jitters?

I'm attempting to make a little 2D top down game.

Currently, I'm working on the custom movement, I've got the camera following the player by being welded to it, but the player seems to "jitter", and if I tap between left and right movement quickly I go double speed, any idea on how I might be able to fix these?

I've tried to Tween movement and it just either slowed the player down or didn't have any effect on the problem.

Here is a video of the problem

https://i.imgur.com/PgW65jY.mp4

Here are snippets of the code:

in one of the two localscripts

local InputService = game:GetService("UserInputService")

InputService.InputBegan:Connect(function(key)
    if game.Players.LocalPlayer.Character ~= nil then --If I want to have a custom menu that has spawning the player as the trigger for movement
        if key.KeyCode == Enum.KeyCode.W then -- If player pressed W key
            if InputService:IsKeyDown(Enum.KeyCode.S) ~= true then -- and if player is not pressing the S key
                script.Y.Value = script.Speed.Value -- Set Y (An intvalue that works with the script below) to a set speed
            else -- If player is pressing W and S then stop Y movement
                script.Y.Value = 0
            end
        end
        --Pretty much duplicates of the same code for A S and D

in the other local script

local Player = game.Workspace.Players:WaitForChild(game.Players.LocalPlayer.Name) -- PlayerModel that holds the Player Decal object
script.Parent.Changed:Connect(function() -- If the Parent(a intvalue named Y) changed
    while script.Parent.Value ~= 0 do -- While the value is something other then 0
        wait()
        Player.Player.CFrame = CFrame.new(Player.Player.Position + Vector3.new(0, 0, script.Parent.Value/10)) -- Add the speed to the playerobject position
        if script.Parent.Value == 0 then -- Break the loop if the player stops moving
            break
        end
    end
end)
--This is moving in "Y" (ZAxisMovement)
--There is also another version of the same script that applies to the X movement

I tried my best at commenting the scripts, please ask any questions.