My 90 bird seems to have a vacuum leak at the throttle body shaft seal. Is this something that I can replace the seal or do I need to source a whole new throttle body. I haven’t been able to find a lot of info regarding the v6 but it seems like a pretty common thing in the v8 cars. If any one has any diagrams, part numbers, links, walk throughs that would be killer

 

you cant fix it, but a machine shop can.
get out your google box and make some phone calls
send your part to them, theyll send it back when fixed.
or find a replacement part...

 

You can usually replace just the throttle body shaft seal without buying a whole new throttle body ,many people use an OEM or aftermarket TB rebuild kit to fix the leak. Look up the TB gasket/seal kit for your 90 V6 it might just list the part you need.