Also, if you follow where the plastic hose goes to you will find the 'switchover valve'. This valves mission is life is to vent the pressure going to the alda (which lets the injection pump know you have boost) when there is an overboost situation that might damage your engine. Occasionally people have had the valve stick open in the venting position and as far as the engine is concerned it isn't generating any boost and won't provide any extra fuel to increase power (same reason for checking the banjo fitting the other members suggested). As a test you can bypass the valve and notice any performance difference.

The ALDA is the square piece of metal with a nut and screw in the center. The plastic tube from the switchover valve connects to the ALDA. To adjust the alda you loosen the nut and turn the adjustment screw CCW. Be carefull to remember where it was just in case your car starts excessively smoking off the line. Living as high as you do I imagine your car is just going to be a slug untill the turbo is able to push some air into your engine.

G'luck and let us know!

John
'79 300SD(2)