I doubt the TPS would cause that problem. If it did it would be because the TPS voltage is too low. You'd actually have the car at WOT, but the computer would be reading much lower than that, thus not pulling timing. But at the same time, your computer would be starving the engine for fuel if that occured.
You'd probably lose quite a bit of power, and it could cause a preignition ping, but I think the problem is more likely gas or ignition related.
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