Cruise Control script not behaving as needed

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#1

I am working on a cruise control plugin for the A-Chassis platform, and its not behaving as I want. When turned on it will jump to a random speed if the vehicle is in motion.

Here is the code, Local script:

script.Parent:WaitForChild("IsOn")
script.Parent:WaitForChild("Values")
ui = script:WaitForChild("WVD_Cruise_Control")
ui.Parent = script.Parent
ui.Visible = true
wait()
local dashlight = ui.On
local mouse = game.Players.LocalPlayer:GetMouse()
local setspeed = script.Parent.Values.CC_Speed.Value
local cfWRot = CFrame.Angles(math.pi/2,-math.pi/2,0)
local cfYRot = CFrame.Angles(0,math.pi,0)


mouse.KeyDown:connect(function(key)
	if key == "v" then
		if script.Parent.Values.CruiseControl.Value == false then
			script.Parent.Values.CruiseControl.Value = true
			setspeed = math.floor(script.Parent.Car.Value:FindFirstChild("DriveSeat").Velocity.Magnitude)
		else
			script.Parent.Values.CruiseControl.Value = false
		end
	end
	if key == "]" then
		setspeed += 1
		print(setspeed)
	end
	if key == "[" then
		setspeed -= 1
		print(setspeed)
	end
	if key == "s" then
		if script.Parent.Values.CruiseControl.Value == true then
			script.Parent.Values.CruiseControl.Value = false
		end 
	end
end)

while wait(0) do
	if script.Parent.Values.CruiseControl.Value == true then
		dashlight.Visible = true
		for _,v in pairs(script.Parent.Car.Value:FindFirstChild("Wheels"):GetChildren()) do
			if v.Name == "FL" or v.Name == "RL" then
				--Straight Outta A-Chassis
				local Ref=(CFrame.new(v.Position-((v.Arm.CFrame*cfWRot).lookVector),v.Position)*cfYRot).lookVector
				local aRef=1
				v:FindFirstChild("#AV").AngularVelocity = -Ref*aRef*setspeed
				v:FindFirstChild("#AV").MaxTorque = Vector3.new(math.abs(Ref.x),math.abs(Ref.y),math.abs(Ref.z))*9999
			elseif v.Name == "FR" or v.Name == "RR" then
				--Straight Outta A-Chassis
				local Ref=(CFrame.new(v.Position-((v.Arm.CFrame*cfWRot).lookVector),v.Position)*cfYRot).lookVector
				local aRef=-1
				v:FindFirstChild("#AV").AngularVelocity = -Ref*aRef*setspeed
				v:FindFirstChild("#AV").MaxTorque = Vector3.new(math.abs(Ref.x),math.abs(Ref.y),math.abs(Ref.z))*9999
			end
		end
	else
		dashlight.Visible = false
	end
end```
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