Check accelerator pumps too.
If theres a slight or BAD lag right when you hit the throttle but a little touchy throttle 'feathering' gets you going then its usually accel pumps.
Clogged or Mal-adjusted. Look in the carb (yeah airlceaner off)...be careful of the backfire though (or do it while the car is OFF- but not too many times or you'll flood it.) and see if fuel is squirting nice and steady for a second just as the throttle is activated.
Good?
Get a weber tech book and follow their advice..
If you have carbs on a car you expect to drive, its worth a thousand bucks to have a book- but it only costs like $15.
Bob O
my prediction: next reply says- go back to fool injection.