good point. The booster sometimes does not have enough vac and the pedal goes very low on the first pump, then second pump brings the pedal up to normal height, with normal feeling brakes. Initially I thought it might be a bad master cyl letting fluid pass internally, but now think it's vac related also.
Am I correct that the bits that shut down the engine are the two lines coming from the key switch? One to the ip and the other to the vac T?