V8 Power Loss

["Randall C. Markarian" <asenna@accessus.net>]

Well, I knew that buying the Mercedes would be bad luck for the Audi!  
Those darn Audi Gods are sooo touchy.

Anyway, the V8 has been running very well since the Ox sensor was 
changed a couple of months ago, but recently, it started to lose power 
and not just when the engine is cold.  Some things that I have noticed 
are that the problem is very intermittant.  It is more likey to occur 
after the cat has been driven and then sat for a while.  Also, when it 
is down on power, it does not downshift as quickly (requires more 
throttle before downshifting) as usual.  Then, the next time it is 
driven, all is fine.

Recent work done:  90K service, some vacuum hoses replaced, and Ox 
sensor.

I keep wondering if it is a sensor going bad or vacuum leak.  Any help 
will be greatly appreciated.

Randall C. Markarian

1990 V8 Quattro
1996 Merc E320
Saint Louis, Missouri