its not hard

hook.Add( "Think", "VehicleBroken", function()
	for k,ply in ipairs(player.GetAll()) do
	if(ply:GetVehicle() != nil) then
    local car = ply:GetVehicle()\
		if(car:GetVelocity():Length() > 1) and (car.VC_Health <= 0) then
			car.VC_EngineOff = true
			KNotify(ply, "The vehicle is broken, fuck you.")
		end
	end
end)