High altitude power loss. At around 8000' elevation, 60 degrees F. Engine was turned off for around 3 hours, started normally, idle normal, shifted into reverse and there was no power. It barely crept out of level parking place with accelerator floored. Engine continued to run smoothly but no power. I was half in the parking spot, half in the street and couldn't move forward or reverse. No warning lights prior / during / or after the problem. Approximately 4500 miles on van. Note - vehicle put into 4x4 low range in...
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attempt to use the extra gearing to move back into parking lot out of the street - this worked at a very slow pace. After multiple attempts to move, about 5 minutes total - it started making normal power again. Minor versions of this have occurred several times at 5000-10000' in Colorado. Van ran normally once back to lower altitudes.