Brand new carb-still problems, help?

"My master mechanic"

^^^^There's your problem.

Learn to do it yourself, or be forever plagued with these problems. Without knowing exactly what you have yourself, doing it yourself and reaping the rewards of accomplishment, you will likely be chasing your tail forever.

If he was your "master mechanic" he never would have returned your car running poorly. Think about that. Let it soak in.