Ok, if you know where the Airbox is, the MAF is dead easy to find... on the top of the Airbox (a big black box behind the left headlamp, Opposite side of the engine bay to the battery.)
There is a pipe that leads from the Airbox top, to the Turbo on the Drivers side. (a large pipe that gradually gets smaller as it connects to the Turbo)
Now, on the pipe, right after the Airbox is an electrical plug. The device that the plug plugs into is the MAF. Though only a code reader will tell you if this is broken.
Now, Vacuum pipes start in the same place, they are directly behind the Airbox.
There are 3 cylindrical "things" these things (they are black with grey tops, look like Kodak Film canisters) 1 slightly higher than the other 2, are the solonoids for the Vacuum operated devices. (Turbo, 4x4 system, EGR, etc.)
There are little black pipes that run right to the devices themselves.
You need to take each of these off in turn and inspect very closely the entire length of the pipe... the one that runs to the turbo is quite long, but you have to make sure there are no cracks, or splits.
If you have splits on the part that connects to either the solonoid or the device, then 9/10 you can cut the pipes back to new rubber and re-mount them.... it helps save a few pennies...

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Hope this helps.
Matt.