intermittent black smoke - update

[Jean-François Roldan]

Hi,

Seems like the michelin man hose was the culprit... I am very curious to try 
it when I pick it up tomorrow morning...

So why was it intermittent then? only when I ever tried to accelerate a 
little bit while on the highway?
It didn't do it at lower speeds like 30 mph... but then again I didn't try 
to floor it either just to check...

more on this tomorrow...

JF
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Message: 1
Date: Fri, 8 Jul 2011 22:07:04 -0400
From: Jean-Fran?ois Roldan <roldan_jf at hotmail.com>
To: <200q20v at audifans.com>
Subject: intermittent black smoke
Message-ID: <SNT118-DS49E6CA18790253C402B8A86430 at phx.gbl>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original

Hi all,

For the past 3 days, I have been driving along fine on the highway when all
of a sudden, the engine loses power a bit, hesitates, and clouds of black
smoke are clearly visible... the back of my car is now all dark from it.
Then it goes away like it came, power comes back, pedal response too...

And a few minutes later or 20 minutes later it starts again... power drops
but speed stays around 50-55 mph. When it is smoking like that, if I try to
accelerate, there is no throttle response, just more smoke... until all goes
away and it is back to almost normal...

any ideas? could it be timing related? TB was done almost exactly 60K ago

JF
91 200 tqa, 210K