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2018 Chevrolet Tahoe — rough idle disappears just above idle speed

SunBeltDad163Community StarterJan 17, 20262018 Chevrolet Tahoe LTDallas
2018 Chevrolet Tahoe LT, about 103,000 miles. Idle has a slight shake once fully warm, but 100–200 RPM above idle it smooths out. No major loss of power. Would you look at mounts, vacuum leaks, ignition or fueling first?
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CityHunter840Community StarterCommunity StarterJan 18, 2026permalink
Start with the test that can prove you wrong. Swap the cheap/easy piece first on the 2018 Chevrolet Tahoe and see if the fault moves. Save the big job until that test fails. Any freeze-frame data saved? Trying not to diagnose from the couch.
TireGal160Community StarterCommunity StarterJan 18, 2026permalink
This is usually cheaper to test than to guess. Get a real battery/charging test on the 2018 Chevrolet Tahoe, not just resting voltage, before blaming a module. If the cheap test changes it, stop and reassess. If it doesn't change the out-the-door or the repair estimate, it's noise. Only after sitting overnight so far.
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