I had this same problem and in my case a new battery was the fix. After 52,000 miles and 3.5 years the crappy stock battery was done. The car would seem like it was going to stall out when stopping at an intersection. I read this thread and discovered about the maintenance Required battery. After adding 1 1/2 cups of distilled water to get my battery back to level, the idling problem was much better, but I could still see the volts fluctuating. I had the battery tested and it was done. I have a new Optima battery now and all is good.
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