John,
Run a search on the forum with "Secondary" "Air" and there is a wealth of information.
You might want to check out this thread.
http://www.brickboard.com/AWD/index.htm?id=804904
This is not a driveability issue - but your car wont pass emissions.
I recently had my pump and valve replaced. $600 parts+labor. For the mechanically gifted it is a DYI. The parts will still run you about $400 though. Poor design of the valve is the culprit apparently, so the valve is replaced with the pump usually.
HTH.
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