This definitely sounds like bad injectors to me. Had a few cars with the same problem. Putting in new injector should take care of the problem.
However, new injectors have to be pressurized. You wouldn't belive how many people just put in the new injectors. Sometimes it's fine, but most of the time you end up with the same problem or make it even worse.
CIS injectors have a certain pressure at which they open and close. In order to get them to work right (when brand new) you need to put a lot of pressure on them to open them up. The car fuel system pressure doesn't go this high. You need to take it to someone that has a pump or you can take it to your dealer. I don't think they charge that much to change injectors.