Stalling right after start up, and hot starts...what the hell is doing this?

[D-Day]

Okay, couple problems, most likely related. My truck has this issue that right after you start it up, (even choked!) it'll run for 3-5 or so seconds and stall unless you keep the foot on the gas to make sure it maintains a constant flow of fuel. It has done this with both an electric and mechanical fuel pump. I've done all I can think of to fix it. However, when you fire it up the second time, it seems to run fine. It's like it immediately runs out of fuel for a second. I let the electric fuel pump fill the lines, and fill the fuel filter up. Gas is in the lines. I'm beginning to think it's the carburetor.

Second problem, hot starts. Now, I can run over a 100 miles, get it real hot, shut it off, take about 5-7 minutes to shut it off and fill up for gas, I'll hit the key, and there's no problem.

However, if I let it set for 10, 15, or more minutes up to an hour, I'll have to crank it over for like 10-15 seconds before it'll start. Even choked. It's like there's no fuel there, just vapors. It's incredibly annoying. However, after it cools after while, such as when I go to see a movie (hour and a half or more to cool off), it'll start fine usually.

I think it's the carb for some reason. I've tried most other things. It's an Edelbrock 1406 on a 400 V8 with a fully open (top and sides) K&N air filter.