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What can you do with your 91 Chevy Suburban 350 after Failed smog you gave tune up changed cat and your O2 went from 2.33 to 2.06 and your HC's went from 923 to 532 What else should or can be done?
Wiki User
∙ 18y ago
leave the vacuum line on the PCV, and pull the PCV out of the valve cover and let it hang freely. It pulls fresh air into the intake, not oily smoke into the intake.
Wiki User
∙ 18y ago
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