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ECU/Oxygen sensor question

If an injector were clogged would the ECU/Oxygen sensor be able to
compensate for the excess oxygen and not set a fault code?  How would
this condition (clogged injector)be diagnosed?  They all seem to be
clicking away.  Would an exhaust gas anylizer show anything?

Has anyone had their injectors cleaned/inspected as routine maintenace
and how much did it cost?

Still troubleshooting this:

1991 Audi 90 Quattro 20 Valve

I have been experiencing surging under light load in 2nd or 3rd gear
light throttle.  While cruising it feels like the engine is cutting out
momentarily, kind of like when the AC is on (which it isn't).  I
the oxygen sensor and now I no longer have a hunting idle after coming
to a
stop but the surging is still there.  The idle also isn't as smooth as
was a couple weeks ago.  I searched for vacuum leaks with propane and
nothing.  Techron didn't work.  Plugs are new.

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