CEL and P1113, P1128

Got my VAGCOM dumb interface today.   CEL on,  so pulled these three codes - too lean, O2 sensor, too rich.  Cleared them and only O2 and too lean came back.  Any ideas?  I have a pin hole leak somewhere in the IC because I can hear it with pressure test, but why would a leak in the intercooler give me Too Lean?  Can there be Vacuum there, to suck in unmetered air, and cause Too Lean - I thought only vacuum is behind the throttle body when you let off the gas?  I'm thinking a leak in IC might cause boost leak and too rich, as air escapes thus causing more fuel in the ratio.  What does intermittent mean in this application?
   

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