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Hi Jim,
That sounds odd. I'd test the actuator first, using the procedure described above (apply vacuum to both ports on the pod). Use a Mity-Vac if you have one, if not, use the source line into the top of the 7-way manifold with the engine running.
Note: With vacuum applied to one of the two ports, it will move a LOT. When applied to the other port, the movement is almost invisible. You can see it if you watch closely though. With a MityVac (the kind with a gauge on it), you want to make sure both hold ~25 inches vacuum. If the diaphragm is torn it won't hold any - dead zero, usually.
If your pod checks out, it's either something with the vacuum plumbing (not likely), or an electrical gremlin (more likely).
HTH,
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