sweeping RPMS
 

Hey, My friend is having sweeping rpms when the engine is at operating temperature and he puts it in park. By sweeping i mean they jump to about 1000 than down to about 500 than up to 1300 than down to 400 than up to 1700 ect till it stalls. I think its the TPS, He has already picked a new one up, i tried finding where the TPS is but the TB is covered but a engine cover, How hard is it to change a TB on this car?

2002 Santa fe
2.7 L v6