If your DISA's vacuum function is totally shot there's a complete Dorman version for a decent price on Amazon for $112 w/ free shipping. I know Dorman generally isn't considered a top tier aftermarket brand but I'd say they're above average. Last year I had to replace my daughter's window reg in her Nissan Xterra and the replacement AZ had was Dorman and seemed well-built; Amazon reviews are mostly positive.

Amazon.com: Dorman 911-900 Intake Manifold Runner Control: Automotive

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2001 3.0i * SOLD *
Current
2010 E83 Alpine White