On the 440 in my Challenger I am getting what I assume is exhaust? out of my breather. I seems to be running fine other than this, what can cause this/what should I look at? It only happens at idle speeds and goes away when the rpms come up. I have a K&N breather on the passenger side and a pvc valve plumbed into the carb on the drivers side. I also have vaccume lines for the a/c controls and power brakes plumed inot the intake if that matters. I just replaced the pvc valve and breather as I thought they may be the problem.