I have a 93 GMC Suburban and I got it from my dad he replaced the fuel lines and put new fuel injectors in it and it ran fine I got it today and it ran great I went to play pool and she I came out my truck wouldn't start I flooded it but waited and I started it again but I put the pedal all the way to the floor and she fired right up so I drove to my buddys house on my way there it acted like it was gonna die I get a block away and it dies I try to restart it the way I did before and it starts but once I put it in gear and press the gas it dies what's going on with my truck

Sounds like your injectors are not metering fuel. If I remember correctly, your system is fired off of the ignition module. This would at least be a good place to start.

Sounds like too much fuel, could be a leaking injector, faulty pressure regulator, or blockage of air intake. Did you replace the injectors and pressure regulator when you worked on the throttle body ? Can you see normal fuel spray on both injectors when the engine is running ?

This is not unusual on a diesel. What happens is there is air in the system. If this vehicle has an electric fuel pump loosen line where fuel enters injection pump then turn ignition key to the on position and watch for fuel to appear and then quickly tighten line before turning off key. Then try to start. If does not have electric fuel pump will need a second person. One will loosen line and watch while other cranks vehicle until you get fuel and tighten line before the other person releases ignition switch unless vehicle starts first. If that doesn't do the job do this where line hooks onto each injector. Probably will not have to do this to all injectors but could run rough until all the air gets out of everything. I have farmed with diesel tractor for 25 years and dad I drove the gm vehicles with the 5.7. You normally don't start a diesel without bleeding the air out of the lines although some will self bleed most won't. Hope this does the trick.

Check if there is power going to the distributor

Check your fuel regulator and replace the injectors.

Check the catalitic converter,fuel filter, sparkplugs and sparkplug wires.

The fuel pump should be in the 20s. Also it could be losing presure slowly. Leave the fuel pump pressure gage on for at least 2 to 3 hours to see if it is losing pressure - It's a start

replace throttle body injector

could be fuel lock or bad fuel pump on the fuel line there is a bleeder line push down on this to see if there is fuel in the line watch your eys to could get you if there is enough pressure also if it would not turn over check all lines to battery sounds like you have a bad line or just loose

check electric fuel pump operation ( located in the fuel tank ). Occasionally a fuel pump will burn out when running out of fuel, due to the fact the pump runs DRY for about 30 seconds till the fuel stops flowing out of the injectors, the engine quits, simultainously losing oil pressure which FINALLY shuts off the fuel pump. Sometimes TOO LATE. Hope this helps