Picked up a 94 GSR Sedan a couple of weeks ago. I haven't been able to drive it until the last couple of days, due to some registration issues. I realize while driving it hard for the first time, that the IAB isn't opening the valves. Rather, it's stuck open the entire time. I pulled the vacuum line off of the IAB actuator and found no vacuum. Not when the engine's cold and first started, or when hot. Anyone have any common issues they can share, first things I can look for?