On the start up thing: Look at the CHOKE PULLOFF. It's job is to open the choke enough to run. The diaphram inside fails often, from heat.
On the after warmed up thing: If this is a Quadrajet, when warm, just before you were to start it; without touching any throttle; open hood, pull air cleaner; look and smell all around for fuel. Carb floats eventually accept some fuel and become heavy, and will leak when warmer...
If you have zero, essentially, signs of raw fuel or smell....Look down the carb, and open the throttle, and hold open. You should see a squirt of fuel into each primary venturi. If no fuel, you should also have hesitation on acceleration.
Another quadra jet issue is drilling plugs. THis is between the carb body and the throttle plates. Rebuild kits have a sponge thing to seal that area, but without it and with leaking plugs, your FLOAT bowl drains of gas.....
If you cannot do these thing, take the text to the person that will work on it. These issues are typical, but when fixed, the Qjet is one of the best and most stable carbs out there.
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