Cleaning the Mass Airflow Sensor couldn't hurt. The MAF finds out how much air is going through the air intake system. This info is needed for the ECU to balance/deliver the proper fuel mass to the engine. It works hand in hand with the O2 Sensor, which makes minor corrections to the MAF's predictions. The sensor works by heating a platinum wire or plate and measuring the current required to keep it at a constant temperature while air blows past it. Over time, dust and oil cake to it. Eventually, those baked-on particles insulate the wire/plate from the airstream, so the sensor won't be able to get an accurate reading. This causes starting/idling/acceleration problems, and well as poor gas mileage.
Get a can of Mass Air Flow Sensor Cleaner. Don't use any other cleaners, as they can ruin the MAF.
Locate the MAF sensor in the air duct between the air filter
box and the throttle body. Remove the sensor from the air duct and disconnect the electrical connector. Spray like 10-15 spurts of the cleaner onto the wire or plate. Don't scrub the parts, because you might break something. Let it dry completely before you re-install it.