Interesting observations from last night's 2020 LT 4x4 brand new test drive. Drove the truck for 10 mins at 50+ MPH, came to the stop kept in idle in D and even after a minute in idle look at the idle RPMs - malfunction or ECM still learning?
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Hmmm.. Here's mine: this is fully warmed up, premium top tier fuel... I have a '19 though, so maybe that won't help you. But, for what it's worth -- ?