So if the vacuum on my 4X4 system doesn't work, then the leak could be from there? Or is it too far from the engine to make the idle erratic? It would suck to have to fix this, even though I don't use it to make my engine stop stumbling. But if that is what I have to do, then....
Also I have a bit of a leak in my exhaust just before the muffler, could this hinder the problem?