I notice it sometimes with my car as well. It's not frequent and I can't replicate it. Essentially as you described, it sometimes 'stutters' on the idle for a moment when coming to a stop. Fortunately, it's never died and doesn't do it often so I've ignored it. i don't think it's intake or exhaust related (I have stock intakes except for the COBB tubes, and it did it before the COBBs).
I'd guarantee your dealer would just shrug if you brought it in and told them about it. Or they'd try to make you pay for a $150 fuel injector cleaning. I think we have to wait until it's either frequently happening or keeps the engine from starting (hope it never comes to either of these).
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2013 Cadillac V-Wagon, RIP Z
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