just changed the alt, plugs, all engine bay fuses, and removed my air pump and my car doesn't hold an idle, only way to keep it on is to give it some gas. car only sat for a couple weeks. i tried driving it around to build up some compression and still no luck...i need this car up and running again

 

wth

 

are you sure you didnt nock off the BACV tube? i did and i couldnt idle for a month. check for any vac leaks you may have caused with out knowing it. also check the clip on the alt.

 

My guess is vacuum leak. I would look to see if you knocked a vacuum line off while you were making those modifications.