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My 2014 Sierra All Terrain. Crew cab standard box, 6.2L. Bought it 3 weeks ago. Loving it so far.

Are you turing on the heated seats before you turn the truck off? The option may be turned on in Intellelink, but the way it was explained to me is that you must have both the option turned on and the heated seats turned on before you turn the truck off if you wish to have them on when you remote start it next time. Edit: Nevermind, just read the manual. They do not have to be turned on manually before shutting the truck off.

My 6.2 makes a quick vibration at even intervals at idle. It's not enough to worry me, but I am thinking about having it checked out. The salesman filled it with 87, I believe (I just bought it on Friday). I threw in half a tank of 93 after realizing premium fuel was recommended. I'm going to see how it runs after I get a chance to put a full tank of 93 in it. I doubt that will smooth out the idle, but we'll see. This intermittent roughness may coincide with the A/C compressor cycling, too. I'll have to see if I can rule that out.