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I don't know if you have solved this problem, but I had a problem where my 95 Bonneville wouldn't go over 4000 rpm's and lost speed uphill, despite that it normally gains speed uphill easily. It also ran fine until I hit 25-30 mph and then it started making a lot of noise from what sounded like the tranny. I took it in to my mechanic and he suggested replacing the nose clip on the super charger and the rings...those are known to go bad on Bonnevilles apparently...no problems whatsoever since then. He showed me the rings upon removal, and they were all broken..every last one. They were stock...I forget what he said they were made of, but it was some material that didn't flex like rings need to. He replaced them with much better after stock rings. I hope this helps you somehow. Good luck.
GMLoyal
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