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I cleared the code last night, let the car idle for 10 minutes and then after driving around for about an hour at various load levels, the car is running well again. The idle hunting has stopped too.
After reading a bunch of similar issues and talking to a Subaru tech, these types of issues are frequently oil related. The tech wonders if a bit of debris made it into the oil during my last oil change and its just worked it's way through the passages and got caught at the sensor or the gear and caused the problems. If so, he said it should sit in the oil pan and hopefully stay there till next oil change. If the problem returns in the next week or two, he suggested I bring the car in and have it looked at and they will honor the powertrain warranty under goodwill.
I will update when/if the issue returns.
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