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I understand your thinking - it's just that I'm sure I've read before that AFM is ignored at WOT (think Adrian said so). I wondered if this was also true when the idle micro-switch was active.
Anyway - slightly OT since it doesn't really apply to idle problems. So I will say that the only time I've had idle problems (apart from when mechanics have over-filled my oil and fouled the ISV) was when I first bought the car and had worn distributor caps / rotor arms.
As others have said check the ISV. It's a quick job and if its never been done before chances are it will need it. I had this hunting idle problem for a while and cleaning the ISV didn't cure the issue, although the ISV certainly needed cleaning. I looked into many of the suggestions above, but in the end it was my distributers. They had a fair amount of carbon tracking on them. I cleaned them up as best as I could and it did help, however I still encountered the issue with reduced level of hunting. Changed them out and have had no issues for 6 plus months. Car has run noticeably better at low RPM's ever since.
Fingers crossed, everything is now working fine, I cleaned out the ISV with wd40 and a good old shake, i also hooked it up to 12 v to activate the mechanism a few times during cleaning.
I also cleaned the ISV muffler, dont know if that was wise, but i couldnt resist while it was off.
I didnt do any prodding, just copious amounts of wd40.
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