Where is the map sensor?

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Now I got a piggy back computer for my car, now I was almost positive of where the sensor was. I even had my dad with me and he identified it as it. However I notice a extreme difference when I mash the throttle. How ever if I rev it a little bit it ends up dieing, and actually almost didnt start. Scared me a little it normally fires right up but it took like 15sec. (Okay we know it is hooked up right, I think it might just be a bad computer. We are calling them monday{an admin can delete