My truck dies when I stop. Help!

[Alvin]

So yesterday i'm on my way to church. Everything seems to be going fine. Then I pull up at a stoplight and my truck dies. Takes a long time to get it started, then I drive some more, stop again and it dies again. Eventually I ended up having to turn up the idle speed, but then the engine wouldn't turn off right when I wanted it to. So now I am turning up the idle before I leave, and turning the idle down before turning the thing off when I get where I'm going. Any ideas? Seems to die only when it warms up. Holley carb and intake, 350. Pretty weird though. Just thought I'd check on here to see if it could be an easy fix before I go spend money at the mechanic. Thanks a bunch. Sorry about the length.

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- Adam L. Vogel
University of Cincinnati
White 68 GMC short, fleet, 350/TH350, 67-8 chevy grille, 5-lugs, front power disc brakes, power steering, a/c (not complete yet)

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