Assuming you are talking about the Mass Air Flow (MAF) sensor, they can get dirty and cause all sorts of issues with how your engine runs. If you have a MAF sensor cleaning kit, it's actually pretty simple to clean.
First, you'll want to disconnect the battery and remove the MAF from the air filter box. Next, use a Phillips head screwdriver to remove the two screws holding the MAF sensors in place. Be careful not to drop or damage the sensors.
Once the screws are removed, you can carefully pull out each individual wire from its connector. Do this slowly and make sure you keep track of which wire goes where - it's easy to mix them up!
Now that all the wires are disconnected, you can start cleaning each sensor with MAF sensor cleaner spray. Make sure you get into all the nooks and crannies, then let them dry completely before reassembling everything.
Reconnecting is simply a matter of reversing what you did to take it apart - screw everything back in place and reconnect each wire to its correct connector. Once that's done, put the MAF back into the air filter box and reattach the battery cable.