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I'm 90% that its TPS. Ideally you'd want to see what voltage the tps is getting, and find out whether it puts out that same voltage at WOT... first try pulling out the TPS plug and spraying some contact cleaner in both the plug and its receptacle, and letting it evaporate. Then plug it back in a few minutes later, let the car warm up, and try it. Definitely sounds like a full TPS check would show it volting up correctly right up until WOT, then showing drastically lower volts at WOT, but could just be the plug.
Also could have to do with MAFS, but I doubt it if its strictly throttle dependent.
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