Why do my rpm jump when idling

Hello, it's so hard to know what's going on with concerns stated, "diagnostic scan" performed, parts replaced, and then trying to figure out from here what's going on. It could be so many possible things. Diagnostic testing is needed to get to the bottom of the concern. Seek guidance locally -- Use this link to find some shops near you that can help with your concern: www.repairpal.com/repair-shops