Are there any tutorials about controlling model movement with keys?

I mean like remote control cars or something. This isn't a request, I just need to be pointed in the right direction. I wrote this script based on a page from the wiki and it technically works, but the movement is choppy.

local userInputService = game:GetService("UserInputService")
local runService = game:GetService("RunService")
local player = game.Players.LocalPlayer


player.CharacterAdded:Wait()

for i, v in pairs(game.Workspace.Tanks:GetChildren()) do
	if v:FindFirstChild("Owner") and v:FindFirstChild("Owner").Value == player.Name then
		tank = v
		moveVector = v.Base.Position
	end
end
 
userInputService.InputBegan:connect(function(inputObject)
	if player.Character then
		if inputObject.KeyCode == Enum.KeyCode.A then
			holdingA = true
			while holdingA do
				moveVector = moveVector + Vector3.new(0,0,-1)
				wait()
			end
		end
		if inputObject.KeyCode == Enum.KeyCode.D then
			holdingD = true
			while holdingD do
				moveVector = moveVector + Vector3.new(0,0,1)
				wait()
			end
		end

	end
end)
 
userInputService.InputEnded:connect(function(inputObject)
	if player.Character then
		if inputObject.KeyCode == Enum.KeyCode.A then
			holdingA = false
			moveVector = moveVector + Vector3.new(0,0,1)
		end
		if inputObject.KeyCode == Enum.KeyCode.D then
			holdingD = false
			moveVector = moveVector + Vector3.new(0,0,-1)
		end
	end
end)

runService.RenderStepped:connect(function()
	tank:MoveTo(moveVector)
end)