According to the setlist program.....I think they are calling the song that your thinking of "Maybe You Know How I Feel" which was played on the 2 dates you mentioned along with 4 other ones.....
04/13/83- Patrick Field House (University Of Vermont) - Burlington, VT
04/15/83- War Memorial Auditorium - Rochester, NY
04/16/83- Brendan Byrne Arena - East Rutherford, NJ
04/20/83- Providence Civic Center - Providence, RI
04/26/83- The Spectrum - Philadelphia, PA
04/21/86- Berkeley Community Theater - Berkeley, CA
correct me if I'm wrong but that looks like the song your talking about.....enless it was a jam during the drums/space segment that somebody mentioned as "bob star" in the comments. (that might be more likely actually)