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I second that, and would add:
Remove the valve completely and plug both hoses. This way you can see exactly what is happening in the valve. When you take the engine off idle, the valve should open completely to maximise full throttle air flow. Back at idle, the ECU should control the valve position to attempt to correct the idle speed. At idle, adjust the idle speed set screw to make sure the valve does in fact move to try to correct the idle speed. Actually, it is simpler to tape/wire/whatever the throttle switch in the idle position, adjust idle to say 500RPM, then use the throttle to increse the "idle" speed and look at the valve. If the valve does not respond as expected, it is either a dirty valve, broken valve, broken wire, or broken ECU.
When you've cleaned the valve, did you disassemble it? The motor brush is trickey to get in place. If you just flushed the valve, perhaps you did not get everything out or you've actually washed dirt into the motor brush/contact. On my 760, I've disassembled it to clean, lightly sanded the commutator, used a dry contact cleaner on the brush, and also placed petrolium jelly on the bearing (and commutator I think).
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