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1990 fuel injected 360 ci engine failing smog by the tiniest margin, likliest culprit?

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Egr or exhaust

Posted on Jul 29, 2009

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I have a 1994 chevy silverado c1500 v/6 4.3 litre and failed smog for high hc levels st idle . what should i do before i take it back to try and smog? ive already done complete tune up.


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