After sitting around for so long, the fluids should have been changed and the ECU reset. If it still gets sluggish acceleration (no push into the seat when you floor it), then it could be the 2ndary water pump for the supercharger. See the thread on that issue. If you already bought it, make sure the E-19 fan control module recall has been done, and have them check that 2ndary water pump. That has been the most common cause of sluggish acceleration. After the fix, it should be great. Make sure to find a Crossfire-trained tech though, otherwise, they will "guess" their way to a solution. Always go to a dealership with a Xfire-tech, even if you have to drive 80 miles to get there.