I was able to fix the issue. If you guys had used pkgbackup, the repos may have been merged or installed wrong from the backup. I ended up going back to Pkgbackup and restored all the repos from pkgbackup--except for the ones giving the 404 errors. I unchecked everything from the restore page except the repos so nothing else would be restored a 2nd time. I had Pkgbackup Overright the repos when it retored again. I then went to Cydia's main page, then went to "More Package Sources" and reinstalled the 3 repos listed. When they were reinstalling, I got some errors, but when letting Cydia load and checking the sources again, they're now working. Everything works fine for me now. Hope it will for all of you too.