91 ninja, rolling throttle quick makes bike...

hello, im new to the forum. just recently aquired a 91 ninja 600 (C) version. it was sittin in front of my frens houz for awhile. i made an offer and it was mine.i recently cleaned the carbs. it runs a lot better but a little rough. when i roll the throttle slowly its alright, but when i roll quickly,it almost dies, or hesitates, stutters, until the engine kicks in, or else it dies. any ideas. when ridin its kinda of slow up to 4rpm, but after that it pulls good. thanks for any input.