Car won't stay running

Took the Duster out for the final time of the season and out of no where it dies. It would start back up but, won't stay running unless I feather the gas. The fuel pressure is good so I wouldn't think the filters or fuel pump are bad. The carb was rebuilt a little over a year ago and has performed perfect. A buddy suggested the needle valve may have dirt in it.:banghead: The carb is Holley 750 DP. Havn't messed with Holleys a lot so I'm not real sure what I'm doin. Any thoughts or advice would be greatly appreciated.