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Reasons for ECU to close your idle motor shut might be following:
- ECU believes engine is idling too high.
- Step-motor in idle valve is faulty.
- Idle valve is wired incorrectly.
If you let the engine run with disconnected valve and it runs with somewhat high idle RPM, ECU will try to lower that RPM by shutting the valve closed. That might be the reason that secondary valve connected to ECU (but not in the loop) is getting shut by ECU. I would recomend swaping the valve and checking if idle stabilizes.
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Thank you for your time,
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