[s-cars] 93 S4 throws a 2341 code.. suggestions needed.

[Postupack, Jeff]

Good morning.
Suggestions needed.

Trouble shooting a loss of power at 5PSI boost and higher.  
This 1993 S4 acts like the entire fuel flow is interrupted, briefly,
until I let off the gas pedal.

Car runs smooth at up to 0 psi (yeah! What fun is that) 
Soon as I roll into da boost, engine power is severely limited. Bogs
down best way to describe it.
 I limped home last night at 0PSI.

Replaced Fuel pump in summer 2007
Replaced Fuel filter on Dec 1 2008, last Monday. 

It's NOT a mis-fire of a single cylinder.. because it acts like fuel
cuts off altogether.

Ran output tests today and all that seems AOK, using SJM website.

Read the ECU codes after a last night (rest area stop) and today (engine
running) got a 2341.
Oxy Sensor Control limit reached.. 

To DO: Boost leak test this morning.. 

LMK because I gotta get down to the GOF in bustling Nelson NH at Mike's
house tonight.
Jeff Posto