oddly enough id get this looked into, maybe there is a problem with the cooling system. the auxilury fan helped level out the bouncy idle? maybe your car is running a bit hot for its liking while at idle (no air passing thought the rad) so i guess what i would first look at is the clutch fan..
while the car is running idle and stopped, open the hood, use something that you can stick into the fan blades (use something comparable to your finger, BUT NOT YOUR FINGER, something maybe rubber like a flipflop lollll) now just see if the clutch fan wants to keep spining or if it stops, it should want to continue spinning.
its not uncommon for the clutch fan to fail, however most people dont know it does until its real hot out, because it will still spin in most cases, but it wont spin like its suppose to.
just a thought
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