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1991 GMC Vandura 2500 Question: idle surges hi and then then almost stalls and then surges hi and continues

 

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scoops, 5.0L V8, Venice, FL, June 17, 2011, 08:04
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I have given her a full tune up now it runs but besides the surging idle witch was the start of the problme but also when you give her gas it tryes to stall untill you get to hi rpms

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