Sooo my car has been idleing funny, hunting up and down in revs.

Sooooo i took air flow meter off cleand it with maf cleaner.
Had battery disconected while cleaning it.

Conncted battery back up. Went for a drive and seemd pretty good.
After a couple days it went back to doing the same thing.

Soooooo i popd the bonnet and realised i forgot to put air flow meter bak on haha.

Is this possible and any answers to why its hunting up and down?