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533/535 fuel injection

This all sounds familiar.  My 533 has never idled smoothly no matter what 
I've done
to it.  As far as mixture goes, i've been doing experiments with changing 
the spring tension in the airflow sensor.  With the O2 sensor disconnected 
and the spring just a few notches looser, the car runs _much_ better.  It 
doesn't feel like it's gasping when you hit the pedal.  Yesterday, getting 
the car ready for sale, I reconnected
the O2 sensor and it started surging under acceleration just like Mike and 
Nat are saying.  Weird.  But soon it won't be my problem! <big grin>  The 
surging idle (different from the surging acceleration) might turn off 
potential buyers, however.  The surging idle is actually a relatively new 
problem.  I thought any vacuum leaks would be eliminated during the cylinder 
head job, but whatever it is, it's exactly the same now as before.  The idle 
control unit looks brand new inside--not even any signs of heat on the board 
under the power transistor.  The problem is intermittent though, and I just 
hope it decides to be good when people come to look at it. (Fat chance)  The 
car _knows_ it's for sale--today the inside door handle broke off. shit shit 
shit.

Garrett