I had the mechanic clean the throttle and he cleaned the airflow after I saw it in your YouTube channel. On my 2013 lx civic. The grunting noise in "D" idle went away. But now idle jumps a little when car down shifts.
I can feel the bump in speed when gears are shifting down even when I brake. Help Scotty!

often they can take a week or so to settle idle down after cleaning. Try that, pray it's just idling too high making it bump like that