Turbo's don't have AMMs. I've been having an idle surge problem on my '85 GLT and after doing a whole lot of things (including cleaning the air flow meter, rebuilding and cleaning the control pressure regulator, replacing the 02 sensor, cap, rotor, plugs, plug wires, engine wire harness (which is needed anyway), and all the engine compartment vacuum lines) I figured out it was the PCV hose, which I guess is a common thing to go bad. I'm not sure if yours is a different shape than mine or what the prices might be like for your but it was going to be about $50 to replace mine. So, instead of spending that much for one stinking line what I've done is where the pipe just pushed into the air line to the turbo (should be an aluminum pipe that's about 2" in diameter or more) I got a 45degree fitting made of brass (I think) for a gas plumbing (like natural gas or propane) from the hardware store and with a wrench and some light oil was able to tap the air line for the fitting with the fitting. Now I can use some 'regular' hose in just a straight piece for the PCV. There was another vacuum hose that had the same style hook-up on the large air line and I did the same with it.
The right angle fitting I used was 1/2" flanged on both sides, and the smaller vacuum one was 1/4-1/8" flanged. I used ban clamps on both lines, although they may not be needed.
I hope this makes sense and helps with the surge problem.