first of all i'd fix that idle. uhm i know my car idles @ less than 1k. 12k is way too much. i'd bring it back down to where u had it b4...
secondly, an AFC would be a very nice way to fix that air fuel ratio but most of us don't have the money. but going back to what ur mechanic said, first of all, i'd make sure that the 02 sensors are installed correctly. maybe even reset the ecu to see if that helps. uhm if you suspect that ur 02 sensors are damaged or to even see if they are here is a good link to test em http://www.forparts.com/o-21.htm
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