Engine/Transmission (1994 - 1998) Auto shifting oddity

[Axtell3]

So a new thread for the current issue. When I start out, the truck shifts fine through all gears, even overdrive, but as soon as it downshifts below 3rd, for hills or a corner, it will not shift back up. I have tried it in drive, and shifting manually. no difference. Shut it off, and It begins again...
I'm stumped.

 

[Axtell3]

SO I will report that after going through all the electrical connections, and cleaning them up, it shifted fine on a ten mile backroads trip. lots of up and down shifting. My PCM has no visible ground strap, so I loosened and tightened all the screws, thinking that was how it is grounded.