My dealer installed the MAF sensor early in 2001. The part cost $171 at that time. Part Number was F5RZ-12B579-C.

You can buy them direct from Ford dealers at discounted prices on the internet at www.parts.com

This dealer site is an example: http://www.parts.com/index.cfm?action=goToStoreFront&sfid=213843

In search block, put in: Mass air flow sensor

As far a installation, the device is a large aluminum tubular unit (about size of a coffee mug)that attaches with a flange on one side, and hose clamp on other. It is inline between the air cleaner and the trottle body. There is an electrical connector that attaches to it. Looks simple to replace. I do not know if any adjustments required after installation.

I'm not sure if you can return the part (electrical) if this is not the solution for your problem. Most parts stores won't let you return electrical devices (unless wrong or defective).

Good luck
Al