After a long exhausting search I located 3 Vacuum leaks that I would like to share with everybody. The first is at the Tee on the vac storage chamber under the right side cowling. The second was a bad vac actuator also under the same cowling. The third a little tougher was the solenoid valve located by itself on the left side of the passenger footwell. this valve had sucked in some moisture from a leaky heater valve and destroyed the valve. After isolating thes 3 sources and plugging or repairing, my system now holds vaccuum overnite. Thanks to all for all the good info posted on this forum.