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You may want to try the fuse pull thing on the L99, just to make sure it's running on the high octane table.
More than once, a dealer has put 87 octane in a new car and that triggers it to run off the low octane table.... and some L99s have a tendency to stay on that table for a while, doing the fuse pull corrects that.
If it is very slight and hardly noticeable, maybe the nature of the beast. My LS3 is slightly jerky when stone cold too. Just a bit cold blooded I guess.
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