I can help with a preowned throttle body mate but before you send over your hard earned to me I would suggest that you give the throttle body a gentle internal clean taking care not to the "disturb" the butterfly.
I would also carry out a throttle body reset as has previously been suggested.
I would also give the MAF sensor a clean and make sure that they have not over oiled your new panel filter.
If at the end of the day you find that you do require a throttle body, then just drop me a pm and I can ship out the same day.
Cheers,
Alex.