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I was diagnosing a bad idle on my car and found:
1. Vacuum hose from inner side of throttle body was disconnected. This solved the hunting issue.
2. The high idle in my case was at cold start. This was a bad EHA valve. Replaced with brand new ($$$) and no more high idle.
3. If it's temperature dependent I would check the CIS temp sensor (4-pin in my 2.6, back of engine head). 22mm socket is what you need but one side has to be ground down to be able to remove (and install the new) sensor. Did this on mine too.
How high is your car idling when you say high idle? On my #2 situation above it went up to 2000RPM.
However right now I'm battling an odd non- or hesitant first crank start.
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