is my trans taking a dump?

I've been rebuilding torqueflites for over 30 yrs. and it doesn't sound like a transmission issue to me. Sounds like it's running lean at idle and the flat spot on take off is another indicator it'd running lean. How far out do you have the air/fuel adjustment screw? Did you adjust the air/fuel adjustment screw while the car was in neutral or gear? Most people adjust them in neutral but you usually get a smoother idle adjusting it in gear cause when the engine is loaded down it takes a little more fuel.