['63GENIII]

So I took it out today to run some errands and try as I may I could not get it to do the 1-2 shift slip that happens once in a while. I was gettin on it pretty good and it was shifting pretty good. Almost like it knew it needed to firm up the shifts cuz I had my foot in it. Most of the time when it doees do it though, it's during normal driving and when you'd least expect it. When it does happen on light acceleration, I just lift a little and it goes right into 2nd. Any thoughts on "power flushing" the transmission? Could there be some debris lodged in a valve or possibly affecting some of the electronics that flushing would dislodge?