Q: High revving enginge

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So we just got this car out of the garage and it drove perfect all weekend (170 miles). The day after we went to visit family a plastic piece was discovered under the car. When I looked it up on fordparts.com it said it was an air duct. I've looked virtually everywhere I can and can't find where it goes. Shortly after this piece is discovered the engine started revving really high like I was flooring it. We cleaned the throttle cables (that worked for about and hour), we cleaned the throttle body (that's did nothing), we replaced the mass airflow sensor, speed sensor, nothing has changed. The gage on the air cleaner is still green. When we take the air cleaner off it doesn't Rev high.

My car has 150000 miles.
My car has a manual transmission.

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