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You can unplug the TPS and take it out of the loop. It wont even pull a CEL, and it definately wouldnt cause any sort of short/open in the wiring/ECU.
TPS would only cause problems at cruise anyway, not at WOT. It WOULD and COULD affect your fuel trims, but I dont think that it is your problem.
Just for grins, put some stock range coppers (anything but bosch IMO). Your O2 sensor could be causing issues at cruise (closed loop) as well.
There are so many things this could be... Wish we could be more help.
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