The Mass Air Flow (MAF) Sensor is used to measure the amount of combustion air flowing into the engine. The vehicles engine controller then adjusts the fuel injectors to get the correct air/fuel mixture.
If the sensor is dirty, it sends the wrong information to the computer, robbing you of power and economy.
This is a fairly easy job . If you can change your air filter, you can clean the MAF sensor.
I did a short HOW-TO on my blog site:
Clean the MAF sensor on 2001 Ford F53 V10 | 2001 Coachmen Mirada 300QB