My first guess: a lean condition. Take out the main jet plug and pump a cup of gas through there and see if anything comes out. Be careful not to lose any parts when you take out the plug.
I had a similar event with my engine last year after it sat for a month getting work done at another marina. She started right up and revved fine in neutral, but just died when I put her in gear. I finally limped her home (just down the creek, thankfully) by pulling the choke nearly all the way out. After I got her home and could tinker a bit, I opened up the adjustable main jet a bit more and she was back to her old self.
You probably have the fixed main jet and not the adjustable, so removing yours and flushing it a bit is your only option. It's an easy thing to check and may pay off.
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