The purge valve is NOT located on the throttle body. What device have you changed on the throttle body? Have you changed the throttle position sensor? Idle air control? See attached image.
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Air conditioning refrigerant lines would not cause this issue.
I would think that even if the vapor canister is flooded with liquid fuel and the purge valve is sealing correctly, no liquid and / or vapor should be entering the induction system through the purge valve???
Have you check the PCV (positive crankcase ventilation valve)? If it is stuck open it would allow excess air and crankcase vapors to enter the induction system and cause a stall at idle. Remove the hose at the PCV valve and seal the end. Does the engine continue to stall? Remove the PCV valve from the camshaft cover. You should be able to shake and hear it rattle. If no noise or movement detected it is stuck and needs replacement. See attached image.
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