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?
No, brake cleaner and starting fluid are not the same. Brake cleaner is used to clean brake parts, while starting fluid is used to help start engines in cold weather.
yes
The fuel is not getting from the tank to the carburetor.
no
No, starting fluid should not be used as brake cleaner. Brake cleaner is specifically designed to clean and degrease brake components, while starting fluid is used to help start engines. Using starting fluid as brake cleaner can be dangerous and may not effectively clean the brakes.