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Why does my 1997 Pontiac Bonneville run rough in the rain?

(1997 Pontiac Bonneville)
in Enid, OK on March 10, 2012
Check engine light has been on since I bought my 1997 Pontiac Bonneville a month ago...i drove in the rain for the first time yesterday and the car ran really rough..with hard acceleration there was a popping sound under the car...what's up?
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