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I have a 2020 Silverado 1500 LTZ 6.2L 4x4 all stock except cold air intake. I live in Wisconsin. This problem started about a year ago. This problem mainly happens when it's cold outside. What happens is I can drive 5 miles or 150 miles, pulling a trailer or not pulling a trailer and it doesn't do the problem everytime but mainly after letting it warm up and then drive somewhere and I put the truck into Park. The engine will just start revving up on its own, then sometimes it will come back down to normal but almost stall out. I have over 20 some videos of it doing this problem. It also never throws a check engine light either. It has been to the dealer 5 times and they have put on over a 1,000 miles on the truck and can't get it to reproduce the problem. Then I pick it up and it does it the next day. They first blamed the cold air intake. So I put back in the stock air box and it still did it. Then they said it was my radar detector, so I took that out and still did it. They have done a reprogram and that didn't help. There was some calibrations off with the throttle body. It started in November 2020 and stopped doing it end of April and hasn't done the revving problem till couple weeks ago. GM is telling the dealer it's because I don't run Premium gas in the truck. They said it is recommended that you run 93 octane fuel. I said yes you are correct recommended but not required. I said if this was a premium fuel issue then it would do it year round not just when it's cold out. The truck was back to the dealer 4 times in the first year and documented through GM. So it can be filed under the lemon law now. The field reps say I'm the only one with this problem which I call BS. I only drive the truck on the weekends because I have a company truck during the week. So the truck right now only has just under 20k on it. I put 6k on the truck from end of April till end of November and never did it once. So GM wants me to run 4 thanks of 93 octane top tier fuel through the truck. So I filled up 2 weeks ago but haven't driven it more then 15 miles. I'm looking to see if anyone has any ideas or have had the same issues or similar problems. The link below will show the last 2 videos that was sent to GM. I have lots more if someone would like to see them. https://photos.app.goo.gl/Hn6WeL1o8E9eeskd6