If it cranks slow after it stalls but okay after a little while there may be something increasing the resistance to rotation. Things that change over time would include pressure bleeding off somewhere in the engine or transmission. Is it possible that the stall is due to flooding and some of...
When you say won't start do you mean won't fire and run or will not crank? Your comment regarding the battery leads me to suspect that it doesn't crank but that's a whole different diagnosis pathway than the idle/stall problem typically associated with not starting after a stall.
Is the stiff pedal from the up position or only after being depressed some amount?
If stiff from the up position the slave is locked up preventing the piston from moving.
Monitor the fuel pressure to see if it drops before the engine stops. You should be able to get a fuel pressure tester from your local parts store for free on their tool loaner program.
You mention the fuel pump is fairly new but did you also change the fuel filter?
After it dies how long do you need to wait to be able to repeat the start/stop process?
If it does start does it run a high speed and only stop at idle or stop regardless of throttle position?
Can the TPS be swapped between the 2? The truck it came from was a '91 but no way of knowing if it the original or if the change over happended during the '91 MY.
Continue to drive it until the tank gets low enough that you can drop it to change the fuel pump.
If your check engine light does not illuminate for a short time when you turn on the key the bulb may be out.
To center the valve, remove the switch and use a pick or small screw driver to move the spool such that the groove is centered in the switch opening, reinstall the switch.
If the brake light is still on the prop valve is still off center and that is why there is no fluid to the rear. Try centering the valve and see if that allows the rear brakes to be bled.
Sounds like you initial/base timing is off and it recovers when the ECM goes to closed loop and starts controlling the timing. Try resetting the base timing (wire disconnected) to spec (not sure what it is for that MY).
There is a bleed valve located on the side of the ABS unit. When the brake pedal is depressed a pin in the center pushes out. Have someone prepress and hold the brake pedal while you push the pin back in and release. Repeat until you get brake fluid coming out when you push the pin in. Let...