1991 S-10 stalls from a stop

Year 1991
Make Chevy
Model S-10 (2-WD)
VIN 1GCCS14A4M0195011
Engine 2.5 liter
Mileage 200,000
My truck would start and idle just fine. When cold it will take off from a stop. It may not be running exactly right but at least it can move itself. Once up to temperature it has a very difficult time moving itself from a stop. If I feather the gas pedal, with great effort I can get the truck moving from a stop. If I just press the gas pedal gently from a stop the engine stalls. It can be restarted immediately but will stall again unless the gas pedal is feathered.

My engine is fuel injected but the symptom seems very similar to that of a carbureted engine with a bad accelerator pump.

Below is a history and troubleshooting thus far.

10-12-06
Tune Up
Replaced oil and filter, anti-freeze, spark plugs, air filter, fuel filter, PCV valve. Truck was taken on trip to Death Valley. Truck ran fine and had no problems.

10-26-05 Trouble appeared
Replaced throttle body, injector and gasket, intake manifold gasket, EGR valve and gasket. Problem is still present.
Original parts re-installed.

3-10-06
Replaced EGR Valve, MAP Sensor
Problem is still present.
I was told exhaust manifold was cracked and O2 sensor needs to be replaced for $1000.00 more.

10-29-06
Replaced oxygen sensor.
Problem is still present.

04-25-07
Re-connected all connectors.
Truck is very hard to start.
I was able to get truck to start by spraying starting fluid inside air intake. Truck will idle but stalls when accelerator is pressed. Since it had been sitting so long, I thought trouble might be due to “old gas” so I added 2.5 gal of gas to the tank. It did not help.