2025 Sierra idle

[AlSeli]

I have a 2025 Sierra 5.3l and I'm wondering if it's normal for it to shake/vibrate at idle? It's been to the dealer 4 times and they acknowledge there is a vibration. They submitted a TAC case with GM and conducted a bunch of tests only to come back and say there is no issue with the truck. The vibration is mostly noticeable while in drive and stopped. I feel it in the floorboard, seat, and see the steering wheel shake along with drinks in the cupholder. When I put it in neutral, reverse, or park it seems to smooth out.

Any insight is appreciated

[Sneaky pete]

Motor mounts. Some of the earlier trucks had issues. Worth a look see.

[Ben1029]

I have a 2020 sierra 1500 SLT and mine has same issue. This is going to sound stupid but this fixed my issue.  Been into dealer 3 times and the last time it was there they replaced the PCV line hose and ever since then it has not happened. They found a cracked fitting on PCV hose and would only shake or stumble at idle.  I would recommend changing PCV line