so i figured out my boost issues i was having, turned out a vaccuum line was disconnected. so i went on to putting on my 3" downpipe. couldnt crack the nuts so i brought it to an exhaust shop and had them crack em for me. got home tried to get the nuts off but still couldnt get em off so i left it, knowing i had an exhaust leak now, i was just planning on bringing it to an exhaust shop for them to do. but driving it earlier if i rev it up and let it fall the car will stumble around 1000rpm and than stall out. could this be from the exhaust leak? not enough back pressure so it cant catch itself? the car ran perfect before. anyone have any ideas?