It's a fairly common problem for the IP to provide less fuel as the components wear and adjusting the ALDA is a perfectly acceptable procedure despite some of the arrogant comment that you've been getting on here. In fact, the individual making the comments doesn't even have an ALDA on his vehicle.

So, let's get to it:

On the top of the ALDA is a locknut and an adjusting screw (provided that you don't have a virgin alda with these components sealed inside a sheet metal can).

Loosen the locknut and carefully turn the adjusting screw 1/2 turn counterclockwise. I'm quite deliberate with the word "carefully" because the screw might be somewhat stuck after 20 years and you don't want to force it. If you force it and snap off the slot at the top............the game is over. So, add some penetrating oil if necessary and take your time.

After you make the adjustment, take the vehicle for a drive and see if you get any smoke a full pedal and low rpm's. If you don't, then repeat the procedure for another 1/2 turn. Same test. By the third adjustment (1 1/2 turns) there should definitley be visible smoke on takeoff. You'll be wasting a touch of fuel at that point but you can leave it there if you don't routimely mash the pedal from a standing start.