The VCV is the 'thing' with the black cap and black elbow hanging off the IP -



There is no adjustment screw. Loosen the two bolts that take a 10mm wrench, hold the IP at WOT, turn the VCV CW until you just feel tension, then tighten the bolts. Not too tight or you'll strip the threads in the aluminum IP case.

You really shouldn't touch the VCV until you confirm the rest of the vacuum system is up to snuff. To wit, if removing the ALDA disabled the engine shutoff actuator, you must have knocked loose the vacuum line to the turret just below the ALDA. Yours might be a plastic dome with a fitting pointing up. I find it an odd coincidence that your shutoff actuator failed right when you removed the ALDA... but I've done stranger things. The point is you need fewer rather than more variables as you learn about this engine. Don't be in a hurry to adjust things you haven't touched. Double and triple check the things you already touched. They're more likely to be the cause you seek.

And if I may continue my finger wagging, my opinion is you should have checked the line between the manifold and the ALDA before simply removing the ALDA. If you then decide the ALDA isn't for you, toss it. But you'll have proper before and after references.

Sixto
87 300D