When it gets dirty, your idle will bounce around, when its cool outside, from 500-1500. At that point, you just unbolt it from the IM and shoot it with some carb cleaner for awhile, to rinse it out, and just bolt it back on. This is generally the cause of fluctuating idle issues, if its not the FITV (older cars)
When it dies, your cel pops on (# 14), your idle shoots up to a solid 2-2500rpm, and on/off throttle becomes really jerky (you need to slip the clutch to keep it even remotely smooth). It then needs to be replaced. If its not totally shot, you can just reset the cel and it will work for a little while longer (before it pops back on).
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