[T2] '76 bay misfires, sometimes stalls: why?

[Mike Benthin]

We have had a blocked tank and poor connections and a bad ECU-
Usually blocked fuel filter (or blocked tank opening) makes pump labor; 
you can hear it cavitating if you listen next to it.  Symptom is more 
like no power/hesitation when you give it throttle.  When we had missing 
in daughter's bus, it's more like someone intermittantly yanking a wire; 
turned out to be connector to the double relay (proved it by wiggling 
the connector; you could hear bus miss- Used a fine dremyl tip to clean 
the brass connector insides and the spade ends, and also used fine 
needlenose pliers to tighten the connector "grip"s.
A lack of starting in her bus was troubleshooted for everything until 
the tests on the "brain" showed a bad value between 2 terminals- another 
brain (75 bus is rarer) worked.

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93 Chevy Roadtrek 210P
78 VW Westfalia Camper