It's tight but you shouldn't have to remove the intake manifold. I had success modifying a couple of bicycle headset spanners, which are thin) into "special" tools to deal with the cramped quarters. Large channellocks can be used to hold the top of the unit if getting two wrenches in there is just not working. You will probably have to modify at least one wrench to the size of the bottom nut (28mm? I don't remember)When the ALDA unit is out you will need to remove (destroy) the sealing cap on top to reveal the adjustment screw. Mark the current setting in case you end up wanting to go back to where it was. Start with 1/4 turn counter-clockwise and replace the unit. If you notice some improvement and want to try for more, take it back out (it will be much easier this time around) and go to a 1/2 or 3/4 CCW. I've read that some have adjusted as much as 1 1/2 turn, which seems extreme to me. In any event, you may lose a little gpm, but you'll have a more responsive car.

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Bart

2002 ML500, 2009 CLK350 Cabriolet
93 300D 2.5 Turbo 265,000 Miles (Sold - bad idea)