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Well, sounds like TPS then. Doubt it's the O2, but yep just unplug the O2 sensor(s) closest to the engine. I says sensor(s) because I'm not sure if you guys have one or two upstreams.
(FYI The IAC isn't actually a sensor, it's a valve. It doesn't sense anything, just opens and closes as the computer tells it to depending on RPM and load conditions.)
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