Q: High revs drives by itself 1994 Ford Mustang

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I was teaching my girlfriend to drive my manual and everything was fine she turned in 2nd gear and out of nowhere my rpms started to hit 3grand and stay there and it's constant and In gear it will drive by it self like my foots on the gas pedal,And after turning it off it makes a terrible loud sound coming from where my intake is at but I just fought a new MAS after the problem to see if it would work and it didn't.

My car has 148000 miles.
My car has a manual transmission.

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