Rough Idling

You could have saved a lot of time and money by having this properly diagnosed. The MAP sensor measures intake manifold vacuum, and apparently is indicating a problem with that vacuum. The power brake booster runs on intake manifold vacuum. If it is not working, you do not replace the part. You find the cause of the low or missing vacuum.

Those comments are not meant to insult your intelligence. They are only to show how too many people get "wrapped around the axle" and make things too complicated. The first thing you must understand is diagnostic fault codes never say to replace parts or that one is bad. When a part is referenced in a fault code, it is actually the cause of that code only about half of the time. Your mechanic will check for wiring and connector terminal problems, and perform some other tests before spending money on a part. Also, there are over a dozen fault codes related to the MAP sensor, and they mean very different things. You need to list the exact code number before I can suggest a course of action. Given the multiple symptoms, I would start by suspecting a pretty large vacuum leak.