where is the mass air flow sensor on a 91' f150 lariat 5.0l?

 

Ihave a 95 f150. Locate your air filter box. If you follow the air intake tube towards the engine, it should be next to the air box. Its black on top, aluminum based. You can see the part # and other info right on top of it.

 

I dont think a 90 has a mass air. That wasnt started until 95.

BM