Sputtering '92 100S 5spd

[Karl Nitz-GKN001 <Karl_Nitz-GKN001@email.mot.com>]

     I bought my car from a coworker last Fall with 72k miles.  At the 
     time, the engine would sputter/hesitate under more than 1/2 
     throttle when below 2200rpm.  By replacing the spark plugs, fuel 
     filter, air filter, and oxygen sensors, the problem seemed to have 
     gone away.
     
     It's back again, now.  The car has 82k miles.  I still occasionally 
     get a Check Engine code of 2411 (EGR).  I will begin to look at 
     these hoses and check for proper connections, but are there any 
     other possibilities for the hesitation?  Like I said, the check 
     engine light only comes on occasionally, and it doesn't matter 
     whether the car is hesitating or not when it comes on.  Actually, 
     the light typically comes on during steady cruise at 55mph or so 
     (usually about 2-3 miles from my house in the morning).
     
     TIA,
     Karl
     
     '92 Audi 100s, 82k miles, with a cold
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     '81 Rabbit Caddy, 124k miles, bought for a song...needs work
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