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@HarryNW - your problem sounds exactly like mine. I have a 2013 2SS automatic, a little over 1,00 miles on it, with a flowmaster outlaw catback exhaust and K&N CAI. Ever since I bought the car, I had the hesitation, bucking, jerking at cold start-up only. Once the car was warmed-up, it ran great with no problems.
FYI - Prior to me putting on the after-market mods, my dealer said it was ok because the above mods do not affect the ECU.
I was going to wait until my first 3k service to bring it in, but I am going to see if they can take a look at it soon. I'll keep you posted with any details.
Please feel free to private message me on this matter.
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