I have an '01 and taken my TB apart, as well as went to the salvage yard at a moments notice to grab a spare
just in case...
If its the TPS (throttle position sensor) - this can be a cheaper but temperamental fix.
Not sure if you have taken the TB off, but the TPS screws are paint marked from the factory.
If the sensor is fouled - you can get a replacement. Ours (2001 & 2002) is the 4-Pin TPS.
a little more info on this TPS here:
Write up: 01-02 T4R Throttle Position Sensor Info
I had a wonky idle (spiking up to 2k and then back down repeatedly) and this was fixed with the TPS replacement. However, I say temperamental because the sensors position is key. If its off just a little, it can cause idle issues which is likely why the factory paint marked them - as well as forced a full TB replacement (including the TPS) if there are TB issues.