TPS will only make a difference at idle, if the switch is open it advances the timing and the revs raise. If the switch is permanently closed (the 2 wires shorted together maybe) it may confuse the ECU as it will think the thottle is shut even if it isn't.
Do an ECU code check, you stamp on the throttle to tell the ECU the switch is working so then it won't bring up the code, but of course it will tell you if it sees no change. An ECU check might bring up other stuff too.
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