Need idle/maf help

My check engine light came on and now my car idles like a hot rod kind of...my tachometer does slighty jump at idle but its not a misfire because it doesnt affect driving performance. I took it to autozone and the obd2 gave me a maf malfunction (forgot what code) but the guy there said it couldnt be cleaned it has to be replaced, is this true? I cleaned out my IAC thinking it was that but that didnt help much. Also when im driving around and are coming to a stop my rpms will stay up at 2k then SLOWLY come down, is this problem related to the maf? According to the scanner both banks are running lean so I really need to get this fixed asap. thanks for any input