AOD delayed down shift

I have a 90 model efi 5.0 and AOD in my car. Lately it seems to have a delayed down shift when pulling up to a light. I lift off the throttle, apply the brakes and it doesn't seem to come out of overdrive until the rpms drop to about 650. It seems ot shift fine leaving a light with OD at about 50 -52 mph. I've checked the TV cable adjustment and it seems OK. I'm going to try to adjust the base idle and readjust the TV again. Any thoughts?

The fluid is almost a year old with maybe 1500 miles on it? I could try changing it. The car does sit most of the time and isnt driven from Oct to March..