I think its the VDC working that causes the jerkiness. It seems to be on overkill in the first 2 gears where giving any amount of moderate gas causes it to kick in. Turning it off makes 1-2 shifting smooth and effortless like it should be. I'm not saying you should go ahead and turn it off every time and go gun-ho though. We've seen enough of the pics of Zs that flew off the road with VDC off.
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