[Excaliber]

When you "give it gas" the vaccum signal drops real low and the vaccum advance does not "advance" without vaccum. It would be as if the you unplugged the advance unit.

Since it seems to run better with the vaccum unit "advancing" this is a clue and here is why.

The base plate that rotates when the vaccum advance unit "pulls on it" repositioning the small wiring leads that provide voltage to the ignition sensor mounted on the base plate. IF those wires are broken inside the insulation (where you can't see it) they may be making better contact when they are moved. When the base plate returns to it's normal position (you step on the gas, the vacccum drops, etc.) the wires are NOT making good contact and the sensor voltage drops.

Inpsect VERY closely the small wires feeding the sensor for signs or insulation cracking, etc. Inspect ANY wires that are affected by the base plate "moving" under vaccum conditions.

Ernie