95 3.4l V6

OK so i bought this car about a month ago, its nice as hell perfect paint and int. only thing i gotta complain about is the horrible idle. It rocks and shakes pretty bad. The place i bought it from said they would do a free tune-up but now i doubt they did anything. Got real bad after an oil change, i had the guy replace the Pvc Valve, is it possible that he just put it in wrong?
Also when it rains and i brake the front brakes make a grinding noise and feel and give way and there i am just rollin through stop signs, lol. What could this be?
-Bodyguard890 http://www.caraccessories.com/images/848001%20Firebird%20320.jpg

well, the pcv is kinda a one way thing, pretty much only goes one way as long as you have eye sight. The idle problem you'll need to describe in more depth unfortunately, at least for me to help you. there are guys on the forum who won't need that though. The brakes, i have to believe that the moisture is a coincidence, and that the real problem is pressure not holding up somewhere. Hopefully some of the more knowledgable will show and break this open a bit more.
Jake