I am using the same start-up and take-off procedures as I used successfully in MSFS 2020 for hundreds of flights if there are changes needed to that procedure, I am not sure what that could be. I manage to take off barely, but any climb, climbs that is no problem in 2020, is a no-go (airspeed drops rapidly, and the plane stalls), I have tried with no passengers, no cargo, and a minimum of fuel, still the same result.
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