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It might be going into the engine from a ruptured vacuum switch (the one with 2 hoses on it that screws into the pump).
Try replacing the switch or at least disconnect the hoses and plug them temporarily.
This is the switch that will open under high pressure demand such as that when you turn the wheel to the left or right all the way to the lock position. This switch will open allowing manifold vacuum to be bypassed back into the engine thus speeding up the RPM's so the engine won't stall out.
Good luck!
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