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Why does check engine light come on in town,but not on interstate?

(1995 Audi A6 Quattro)
in Corvallis, OR on August 24, 2012
lower speeds and rpm light comes on.Higher speed and rpm will stay off until I reduce speed to 2000 rpm.
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Popular Answer
on August 24, 2012
Scanner can answer that one,have test performed.
of Greg's Orange Auto on August 24, 2012
HAVE CODES SCANNED AND POST ITS COULD BE SEVERAL ISSUES
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