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I have to squeeze the line to the 3/2 to shut the engine off.
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You have verified my theory.....you have a vacuum leak in the 3/2 valve circuit, which when plugged or squeezed, allows the vacuum to build in the line going to the shutoff valve. I'm not sure what all that circuit does, but I know it controls the EGR valve....but not sure what else. If you have a mighty vac, it shouldn't be very hard to chase down the leak. It's either find it and repair it or separate the vacuum sources once more. Whatever, else the 3/2 circuit does, it probably hasn't been doing it properly...this includes the EGR circuit (which shouldn't be a problem).
Good luck!