Model moving script wont work?

How would I make this work / what's wrong with it?

local Model = game.Workspace.Model
for i = 1, 100 do
Model:MoveTo(Vector3.new(Model.CFrame = Model.CFrame + Vector3.new(0,0,.01))
wait(3)
for i = 1,100 do 
	Model:MoveTo(Vector3.new(Model.CFrame = Model.CFrame - Vector3.new(0,0,.01))
end

You missed ends

local Model = game.Workspace.Model
for i = 1, 100 do
Model:MoveTo(Vector3.new(Model.CFrame = Model.CFrame + Vector3.new(0,0,.01))
end
wait(3)
for i = 1,100 do
    Model:MoveTo(Vector3.new(Model.CFrame = Model.CFrame - Vector3.new(0,0,.01))
end