Thanks for all the advice fellas.
TnBob. I'm going to review my service records to see when ignition work was last done. Since I don't use this as a daily driver any more, it may be some time, not necessarily miles since I had routine ignition work done, or the air filter changed.

Duke 2.6. I don't think it's the cat. No loss of power at high speed. However, I did go in with a "cold" engine. Normally I'll run it up and down the highway to get it good and hot, but since it's every other year and I needed an appointment before 12/31, I went in the middle of the work day.
I think the idle may be too low. It idles at just above 500 - say 600-650. What's normal idle for a 103?

I'm no DIYer, so, I'm just trying to get some possible problem areas to have checked out. My indie is a competent guy and lives in the neighborhood.
I'll keep you informed of the outcome.