Jay, I'm guessing you still have the idle surging and hot-start problems, since those are what I found in a previous post. Note that in my case, there were other symptoms as well - surging and poor engine braking on decel, and occasional wild swings up to 1500-2200 rpm at idle. None of these have returned since I replaced the pot. In your case too, the car may have spent a greater percentage of its time on the road over the years in motion, instead of idling in rush-hour traffic - which wears that one spot excessively.

There is still a degree of roughness at idle - not silky smooth - that I interpret as injectors with a less-than-perfect spray pattern. This, since I have replaced all the intake hoses and cleaned the idle control valve (and valve job recently too). The actual speed variation is just barely noticeable on the tach, but perhaps this is the idle surge you notice too? I have the correct injector seals on order, and will try my hand at home-brew cleaning and diagnosis of the injectors when they arrive.

If you are getting bigger swings, and have not yet replaced the idle hoses, these harden and form poor contact at connections, allowing air to enter and bypass the airflow meter. When I replaced ours, I also did the rubber lower plenum of the airflow meter - all together pretty inexpensive from FastLane.

Steve

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'91 MB 190E 2.3
'08 RAV4 Ltd 3.5
'83 Lazy Daze m'home 5.7