New to 340 so I have questions

I think I may have found the issue.
Two of the Nuts on one side of the carb were snug and the other two were kind of loose. Also the PCV valve was freely loose in the hard a a rock grommet that was split in two areas. I am now waiting for a new replacement grommet that I ordered online. The pcv valve was a little sticky so I cleaned it out and it now functions as it should.
That could very well cause some issues. Vacuum leaks are one of the #1 problems. Good luck, Nick. Keep us posted.