2018 Kia Optima — rough idle disappears just above idle speed

If it were in my driveway, write temp, speed, and in-gear vs coast when the 2018 Kia Optima does it — then decide on parts. If the cheap test changes it, stop and reassess. I'd want a dollar figure or a measured spec, not 'should be fine.' That's my plan before I call anyone.

I went back under the 2018 Kia Optima and it only happens after a heat soak, not on a cold start. Not interested in a five-hour wait for a shrug.

It did rough idle disappears just above idle speed twice this week, both times after sitting. No change in mileage feel. Video is ugly but it shows the hesitation.

Start with the test that can prove you wrong. Two 2018 Kia Optimas can feel identical and have different causes, so measure before you copy someone else's repair. You'll know quickly if you're on the wrong tree. I'd want that in writing, not as a promise. Your commute and mine probably aren't the same, but the test still applies. That's my plan before I call anyone.