The only song I know of called "I'll Go" is by Twinkie Clark and she performed it w/ the Florida A&M Gospel Choir back in 97. Did it have two guys singing in it? If so, thats your song. One of the guy's name was Byron Stephenson, who wrote the song. (VERY, VERY good song writer). He also wrote "I Won't Complain" w/ Karen-Clark Sheard. That song was also performed with the FAMU Gospel Choir. The other guy singing was a student. I have that concert on DVD. You should check it out on amazon.com. Its amazing to hear the complex chords and progressions they were using back then.
BTW, the song is in E Flat.