When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Congrats and welcome to CL. Use the search function to help you search for topics you may have questions to. Also read the start here/must read thread.
A fluctuating idle is not normal. When cold, idle will start off high, then eventually work it's way down to normal. But it will never go back up once it's already gone down- or at lease I've never seen that on any car over the years.