Mingus has just over 1k miles. He has done something odd during warmup the past two days after being started for the day. After a minute or so, the idle isn't necessarily rough, but it bounces between 800-1800 rpm for 15-20 secs and then evens out. He doesn't do it anymore throughout the day. It only happens with the first start of the day after 10-12 hours of rest. Should I be worried?

 

You will want to get that checked out, and when you do be specific in your description that it only happens once each day. Its probably best to do an afternoon drop off with a loaner so they can cold start it in the morning and already have it hooked up to the diagnostic machine to monitor it.