Motor won’t stay running

If the carb idle cir is not working properly exactly what you describe can happen.

moparhunter said

So far, I can’t keep it running long enough to grab a squirt bottle

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Have some one else start it. While you stand ready with the squirt bottle.

Also just because it was tuned to run on another engine does not mean it's tuned to run on this engine.

I hope you find the issue.