rev bombing??

[MOMO.SuperHicas]

for some reason my car likes to rev bomb down to like 500rpms but when i come to a stop it will pick back up to like 900rpms and hold all day long. i not sure if it has to due wiht bad grounding or vaccum leaks but i pretty sure i dont have any, ive looked them over pretty well
any ideas/solutions?

[jspeedm]

its either dirty throtle body or idle valve or both. clean the throttle body first.

[MOMO.SuperHicas]

should i take it off to clean it and what should i use???

[super240sx7185]

It's more than likely the iacv search on here how to clean it.