A/T Not Shifting Properly

[MIK3]

Alright, here is the deal. I'm driving. And I reach about 50mph or so. It gets to about 3100rpm's. If I let off the accellerator, and then push back on it, not hard...the rpm's climb as if I were in nuetral. It doesn't shift until I either get to about 5000rpm, or I let off the gas for about 5 seconds, and then it shifts, once I push the gas again. Is there something I have to replace here? I am replacing my sparkplugs and wires soon. They are as old as the car, so would this help? Anything will help with responses, thanks.

[Cheeseburger]

is it a automatic

[BITESIZE]

Sounds like the same problem my automatic had before the swap. You're tranny is dying, or it needs a fluid flush.

[A20A1]

too much heat... or lack of fluid... or you have some bad adjustmets to the TV cable.

[MIK3]

Well I don't think heat is a factor, because even in the cooler mornings, it does it. It is either it needs a flush, or yes, my tranny is sadly going....