New problem, can't maintain steady speed.

Last Saturday I did 100 miles, mostly highway about 60-70 MPH. Just cruising along at steady throttle, trying to maintain speed, the bike will gradually slow down as if I closed the throttle slightly. I try to compensate by adding throttle but it doesn't respond, more throttle, then pow it jumps to life with a kick and I get back up to speed. It all happens within a few seconds and then 60 seconds later it does it again. Over and over again. I tried several different gears and speeds, I cannot maintain a constant speed. Today I was riding a winding country road, stuck behind a car at 40MPH and it was doing the same thing. This time with less wind noise I could hear the engine sound like it was bogging or dying. It's bad enough that my passenger asked me what was wrong with the bike. It runs fine otherwise, I can run it up to redline and carve corners all day, it only acts up at steady throttle. The bike is stock except for a power commander. Last week I was using the canned map from Dynojet, today I was using the cozye map. Anyone else have this problem or know what might be causing it?

 

Maybe the TPS sensor has a bad contact in that part of the throttle postion?