I can’t remember the exact timeline, but in the early 1990s KMJQ veered off into a younger, more upbeat sound branded as “102 Jamz”. It appeared at the time that Y98-5 was filling the format hole that KMJQ had created. Y98-5 actually pulled in some respectable numbers for an eastern rimshot. However KMJQ eventually returned to Urban AC, which pretty much sank its upstart format competitor.
I think I still have a few unscoped hours of the Y98-5 Sunday Jazz Brunch on cassette tape somewhere (Not to be confused with the Sunny 99 Sunday Brunch, a similar show from that era...I also have an air check of that.)