Deceleration issue; Tranny, TC or TPS?

[Tbruz]

1997 Tahoe 4x4 2 door with 125K miles; regulary gets 14.3 to 15.7 MPG.
Truck shifts smoothly and accelerates fine(maybe a little sluggish in the acceleration department)
I'll be cruising along at higway speeds, 55 to 65, with no issues.
If I need to decelerate to around 45 MPH, then try to accelerate, it seems as though the tranny slips, almost like it can't decide if it should be in third or forth gear. If I give it more gas it seems to shudder then ulimately shifts up.


Has no problems if I decelerate below the 45 MPH range nor does it have any issues shifting up thru the gears from a dead stop.

Do I have an impending tranny issue?
Tranny was serviced at 105K miles with a pan drop, newfilter and new fluid; WAS NOT FLUSHED. Runnning Amsoil synthetic and fluid looks red still.

Could this be a torque converter issue?

Simple as a TPS issue?

Thanks in advance
Tbruz

 

[retorq]

Usually with a TPS issue the truck will have ****** acceleration all around, that doesn't sound like that is the issue but it's still possible. Any other symptoms? Codes? Lites?

 

[Tbruz]

No SEL or CEL; No Codes stored either

Thinking more about the acceleration part; it really isn't very good; wouldn't quite decribe it as ****** but certainly not a "neck-snapping" peppy acceleration either.

Thanks
Tbruz