Rpm's jumping around.. HELP

[wombatslayer]

In park sometimes the car's rpm's jump around. First it goes like it wants to stall. Then it pick back up, then it drops and so fourth. Another thing is that it's loosing coolant. Fast. Either it's a head gasket or it's just a leak. But for the jumping of the rpm's is it because I should clean the mas airflow sensor? My filter fell off of my cai. For an unknown amount of time. Maybe dirt got sucked in and the airflow sensor is all messed up? That would be my only guess. That or it's the head gasket and coolant is in with my oil.