Question about 2001 Buick Regal

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2003 Buick Regal acceleration/shifting problem. My transmission would shift very hard and seemed like it was slipping before it would go into gear. Took it to a garage and they did a diagnostic test on it and they said it was the tranny - it would need to be rebuilt for $2300. My husband and son bought a used tranny at a salvage yard and put it in. The shifting problem is gone, but I still have the acceleration problem. When I push the accelerator to the floor it seems like it doesn't have any power and when it gets to 60 mph, it goes to 4000 rpm and the Check Engine Light comes on. Any ideas what it could be?

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