Fuel Injections? Not Efficenicy?

I am getting my turbo parts this week, I went to Canadian Tire to do a full check on my engine. They found out that :
1) The fuel injections has problems.. they didn't specific what problems they are..
2) and.. i am not sure what he said, but there is a inefficenicy in the engine's fuel and air.. i think... he said this might casued by a vacum leak...
i am not sure if these are the same problem.. coz if the fuel injectors are not working well, it will not have the engine running at full efficency, right? that's what I am wondering..
but let's say it's the vacum leak, where is it possible of leaking? Will this be able to fixed easily and cheap?
If my fuel injections have problems, then I can upgrade the fuel injector for my turbo, right? Which one should I get?