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Should be able to buy the concentrated form of Techron at any parts store. The BMW dealer also sells bottled of the fuel cleaner (says BMW instead of Techron on it, but its the same thing).
AFAIK, if the diaphragm is ok, the CCV is ok. If you can monitor the engine adaptation values that would give a hint if there is a vacuum leak or not.
If you do lots of short trips, I'd still bet on carbon buildup or dirty injectors.
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Olympic Peninsula, WA, USA
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2005 Mini Cooper 100k, British Racing Green/Silver-Black
04/2002 4.6is 140k, Silver/Black-Alcantara *FOR SALE*
1989 325iX 270k, Diamond Black/Black
1984 318i 370k *SOLD* (First Bimmer)
Honorable Mentions: '71 2002, '87 325, '90 325ic, '92 525it, '93 325i, '94 530i
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