Exactly what Rob has said. A common problem with massive fuel injectors, particularly old style injectors like indy blues and rochester injectors in the 1000-1600cc is that a small pulsewidths like when you are idling, cruising or low throttle inputs was that they had woeful spray patterns so the fuel didn't atomise very well, and they were hard to control at short pulsewidths - ie they weren't very accurate at how much fuel they would inject. This is why a lot of bigger power setups you would see from the 90's would have an extra injector or staged injection, as it was the only way to retain driveability. Thats also why mazda used staged injection for rotaries (and trying to meet emissions.)
Modern injectors, particularly the bosch injectors (ID injectors, bosch motorsport injectors etc, they are all the same thing) Have really good control, and in the case of the id2000's, have a very low latency, which allows for good control and improved driveability compared to older design injectors.