Engine chokes down when sitting.

[Chevyman680063]

I went out last Thursday and the truck ran fine on the way to where I was going. When I left an hour later it kept trying to shut down whenever I would come to a redlight. I pulled the spark plugs the other day and they look fine as well as the wires. I also noticed the exhaust smell is a lot stronger when it chokes down. When I first start the truck it runs fine but as soon as I tap the gas it chokes down. I also could not find a fuel leak anywhere. It is a 350 with an Edlebrock 600cfm electric choke carb. Thanks for the help guys and here's a video I made as well.

http://www.youtube.com/watch?v=si4jC...ature=youtu.be