It starts to chugg or skip when driving at a consistant speed.. on 1999 Buick Riviera

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The tranny is not slipping if you speed up it goes away??
(2) Answers
(5) Comments
Scanner will show the problem, even without light on. A scanner, not a parts store code reader!
No luck with the buick dealer!? Jus t $$ it seems to only do it in top gear at 35 or 70 time to give up on this one?
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