As you can see the vacuum line is extreme frayed and air that is not accounted for by the computer is leaking into the intake manifold causing the lean mixture condition. The line above is short and connects to the underside of the intake. It's fairly easy to remove with some needle nosed pliers. The new installed vacuum line is shown below:
Here is a picture of the old line, the pliers :-), and the new hose:
Both ends of the hose were completely frayed. A useful tip is to install a longer hose on the underside of the intake to make sure you have enough length as you route it through the maze of other hoses. You then cut the hose to the appropriate length. If you cut it first you may run into difficulties.