Yeh...I had the issue too at one point but I guess it was not as bad. My 0-60 was 20+ seconds. Apprently it was common at Benz shops to bypass that Valve. It is the overboost protection valve. There are two simar valves, this was the one towards the inner compartment on the firewall correct?

Mine has been bypassed for 2 years with no problems. Apparently they clog up often...but who knows. And yeh, I had the same reaction when
mine was corrected "Oh, so this is what I've read about!!"

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1987 300TDT - 195,000 (Original #14 head)
1993 190E 2.3 - 105,000
1981 300D - 250,000