Is the vacuum advance valve connected to the distributor? What is the valve near the brake booster that one of the vacuum lines from the distributor goes to? What does it do?
www.cabby-info.com has Vacuum diagrams.
What do Divorces, Great Coffee and Cars all have in common?
They all Start with good GROUNDS.
Replace all of them that you can, 99 percent of flakiness will disappear.
92, 93 Cabriolet.... 89, and 90 are Deceased.