How are you doing? As a fellow g2er i know what your talking about my other white teg had the same problem and since you are a 92 you have a obd2 and the issue lies within the o2 sensor being faulty you should go out and buy new ones i think they are only like 10 dollars or something and then bring it and get it replaced. and if that is not it i may be your pcv valve but i am almost promising its your two o2 sensors and although it passed the test that wouldnt effect the emissions. let me know what happens