Problem with MoveTo, any ideas?

Usually I don't have a problem with MoveTo, but as I try to move a model in this script it flickers from side to side, which ruins the entire effect. Is there any other way to move the model, or is there a mistake I'm making which is screwing up MoveTo?

local xpos = Workspace.Model.Base.Position.x     
wait(3)


delay(0,function()
for i = Workspace.Door1.Position.X, Workspace.Door1.Position.X - Workspace.Model.Base.Size.X/2, -0.2 do
Workspace.Door1.Position = Vector3.new(i, Workspace.Door1.Position.Y, Workspace.Door1.Position.Z)
wait()
end
end)

delay(0,function()
for i = Workspace.Door2.Position.X, Workspace.Door2.Position.X + Workspace.Model.Base.Size.X/2,  do
Workspace.Door2.Position = Vector3.new(i, Workspace.Door2.Position.Y, Workspace.Door2.Position.Z)
wait()
end
end)

for i = Workspace.Model.Base.Position.Y, Workspace.Door1.Position.Y, 0.1 do
Workspace.Model:MoveTo(Vector3.new(xpos, i, Workspace.Model.Base.Position.Z))
wait()
end