Assuming it runs on its own once it is started, try replacing the coolant temp sensor, the one located next to the thermostat housing. The part should be less than $15.
check fuel pressure must be at least 55 pounds of pressure I have fix few of these trucks and replacing fuel pump fix the problem also change the fuel filter
these engines do not start with less than 55 pounds of pressure
1995 blazer350 v-8 wont start unless i use starting fluid,once on it idles high
sounds like its not getting fuel
Replace the engine coolant temp sensor.
Probably the most common reason would be the fuel pump is bad. Squirt a little starting fluid into the air intake and try to start it. If it starts and runs for a moment, it's the fuel pump.
its a bad fuel pump. it works enough to keep it running but it isn't putting out enough pressure.
Check the fuel pressure regulator.
Maybe a clogged fuel filter?
yes
no
The fuel is not getting from the tank to the carburetor.
Take the ignition control modual out of the distruboter and have it tested at your local parts store. The have a tendency to have that exact problem. They willl not inject fuel on the enital start up.
you have a lack of fuel or fuel pressure troubler