Question about 1987 GMC Suburban

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87 gmc suburban wont pass idle test

Passes all other aspects of emissions test but will not pass co test @ idle speed 350 tbi

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  • Anonymous Mar 15, 2014

    can't pass emissions pressure test

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  • 43 Answers

Check vacume pressure at carb. diaphram had sim. prob. with 78 caprice

Posted on Jan 06, 2009

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we cure your trouble that caused your engine light to come on and you will pass your test.
later
paul

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