have a 2006 STS AWD V8 with 22,000 miles. When letting of the gas and then reapplying it, I notice a rocking sensation, or bang. Also on acceleration from third to fourth gear there is a large drop in rpms. This happens in automatic and manual mode. I have driven other STS's and this does not happen. Any idea what is going on?

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'06 with 22k will be under warranty, as you know........ not sure what would cause your situation.... have you checked fluid?