Any thoughts on this engine issue

If you have a vacuum gauge, set the idle mix screws using it.

Have you set the float levels? Checked if fuel was dripping from the boosters?

I'd start over on tuning it. Set initial to 16 BTDC, Re-baseline the idle mix screw settings, 1.5 turns out, set float level and trying tuning it. Highest idle vacuum, leanest setting.