Yes your truck is equipped with a mass airflow sensor (MAF). However, I would not just replace that because its running rough. I would begin diagnostics by first checking to see if there were any trouble codes in the engine to give you a clue as to the rough running condition. I would expect a trouble code to be present to support the descision to replace the MAF Sensor. If no codes are present I would suggest that you get the vehicle tuned up. (Spark plug replacement and throttle body cleaning and I would also suggest removing the idle control valve and cleaning the carbon and dirt out of it. Although what you were told might be correct I dont belive that is where I would start.
On your vehicle, it is called the MAF or Mass Air Flow sensor, not the MAP sensor. It is on the air box lid just to the left of the orange boots on the intake tube and has wires going to it. This guy has done a great write up on your truck. http://tundra-mpg.blogspot.com/2009/02/cleaning-maf-and-throttle-body.html
No the MAP sensor, Manifold Absolute Pressure, sensor is found on the intake manifold for measuring pressure (more properly vacuum) within the manifold. I am not certain but I believe there is a idle valve found on the throttle body too, if so I'd check this too as this would help control the engine's idle.
I hope this may have assisted you,
Tom
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