Hi All

I just had my brake booster replace about a month or so ago. At the time it was needing replaced I would have a rough idle and a sputtering at the time of braking. The brake pedal would also be hard to push as well. Now I am getting the same rough idling and sputtering when applying the brake but none of the hissing noise or an issue of the brake pedal itself. The braking actually feels fine. Could this be a vacuum leak around the booster? I am really crossing my fingers that it is just a bad hose. Any suggestions?