They should be as soft as heater hose if not softer. Replace them, they are surely leaking. The one from the air meter horn is easy, the one to the manifold (with the cold start valve in it) is a bear. It will run much better.

Replace all the other bits of rubber hose on the vaccum lines, too, they are all probably rock hard and leaking, or gone mushy and leaking. Replace the hose to the MAP sensor on the left fender, too.

Clean the ICV again by filling with carb cleaner, covering the holes, and shaking the carb cleaner around for 30 sec, then dump. Repeat until it's clear coming out. This will take a while a several shots of cleaner, you need to dissolve all the old gasoline residue.

That should fix it.

However, if it starts to stall while driving at open throttle, replace the fuel pump relay and have the current draw for the fuel pumps checked!

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!