strange ! I got a notification that Jim responded here but it didn't show up on the forum
weird !
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If this problem happens with the throttle wide open, I doubt if it's caused by a vacuum leak. If it happens at part throttle, it might be.
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....Not at WOT.... only on trying to open the throttle where the vacuum is at it's highest
of course when you open the throttle the vacuum drops dramatically... but it is fairly certain that when the throttle is opened the reason for the Sog or bog is because it is too lean to ignite...so the engine stumbles and dies..... pointing to a big air leak somewhere....
I'll check that smog valve ...I bet that is it ! i'll let ya know if that fixes it...I'll go test that now....
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Bob.....