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I was the guy who said he replaced his idle control motor. I had similar symptoms for about 6 months but it was more intermittent than your bike. I first tried replacing the temp sensor without any improvement. I talked to a number of mechanics, both HD and non-HD and got a lot of confused looks. Then one day I'm complaining to the service counter guy at Seminole HD in Sanford. One of his mechanics happened to be there and he said it sounds like a bad idle control motor. He walked outside to the bike and had me cycle the ignition off/on a few times. He said the sound it made (ie noisy gears engaging) was a tipoff that it was a problem with the motor. The part cost $45 and another $95 for installation. That was a month ago and I haven't had the problem since. The funny part is the bike seems to run better overall. I don't know why that is but I'll take it. The morrow to the story is you need to find a good mechanic. I talked with other mechanics at the same HD dealer previously and they didn't even mention the IAC motor.