rd2000gt

I bought a 2000 gt a month ago & it ran Perfect..couple days ago I finally opened her up to about 110 or so.., when i slowed down the idle was stuck on 3000, a quick rev and it came back down. but now it idles at 1000 all the time , and when I m driving it sputers and spits bad if I give it more than half throttle, any clues?
Thanks
BTW I am new to Mustangs and not real sharp on technical terms, but I really want to learn

rbstang

TPS = Throttle Position Sensor. Might be fried...