Concur.  This was the exact cause when my 82 300SD exhibited same symptoms.
In my case the leak was in the little rubber hoses that connect the
electrical vent valve (forgot the real name) to the hard lines.  This is the
valve on the firewall that vents the boost pressure to the ALDA when the
transmission is shifting.

Scott

-----Original Message-----
From: mercedes-boun...@okiebenz.com [mailto:mercedes-boun...@okiebenz.com]
On Behalf Of Jim Cathey
Sent: Friday, July 15, 2011 12:55 AM
To: Mercedes Discussion List
Subject: Re: [MBZ] Vacuum Pressure Converter for AT - what's it good for?

> too ashamed to admit my ignorance [Hop up mill] and plead for an 
> explanation,

Probably fixed pressure leaks on the line from the intake
manifold to the injection pump, which prevented the IP from
thinking there was any turbo boost so it didn't fuel as much
as it needed to/could have.

-- Jim



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