Ok, now I didn't think to check the dash as the when depressing the pedal, for codes. The engine revs fine in neutral. In gear, idle only. There is no attemp of the engine to gain RPM, bog down, or slip, when in gear.
I disconnected the trany soliniod, put the truck in gear and it reved up fine. The dash was blinking w/ all its lights, but it rev up fine, and put the connection back. I pressed the inch spool, put in gear, idle only.
I arrived early in the morning before initial start up, (difficult to understand non-English speaking people). I found, that the truck moved, and reved when in gear.
After several minutes, idle only when in gear. We let the truck idle while working several hours on another machine, idle only in gear.
We do not get a slow mode, we get idle only in gear. It would seem that it is temp related, and an electric signal issue.
We trying to isolate the problem, and dont want to just replace sensors. But the 4 wires on the trany soliniod have a some type of signal entering and/or leaving to the ECU.
The fuel pressure is about 55 to 58 lbs for about 1 sec w/ the key switch initialized.