April 9, 200817 yr I have a 1994 Impreza 1.8 Trying to get it smogged (in CA) It failed the "Idle Emissions" at 739 rpm hc measured 430 co measured 2.51 Everything was great at 2390 rpm. hc: 11 co: 0 I'm trying to find out the most likely cause. Thanks.
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