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most common problem causing a surge while a car idles is the MAF-Mass Air Flow sensor is contaminated. typically this will throw a code (check engine light aka MIL)

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Q: Why does your 1992 Buick Roadmaster idle up and down?
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Your 92 buick roadmaster revs then kicks down continuesly runs fine at speed tries to stall at lights and now wont start why?

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