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oh sorry, air flow meter, i think the 20v has one, it's the flappy thing that measures how much air goes into the engine, unless yours happens to you a manifold air pressure sensor (map)
The afm is always somewhere between the throttle body and air filter and has a wire connector going into it, you can't really miss it, and if you take it out you can look in and see the flappy bit.
I belive you test it by hooking up your multi electrical tester between two of the leads and measuring resistance when the afm flap is open and when closed, and make sure it's within the proper specs. (which i don't have for that engine)
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