failed emissions test- high HC's

so my 1992 325i failed part of the emission's testing here in california. everything was good, but the HC's were high at the 15 mph speed test. the technician didn't give me any sort of detailed report but wrote on it "raw fuel" what are some common issues for the unburnt fuel? also what would most likely be the culperate? I myself was thinking spark plugs or 02 sensors, but I would like some input
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