I've had the truck for 3 years and never had this issue before. I washed the truck today since it was filthy. After that I made a slight adjustment to the curb idle speed (raising it from 500 to 650, just to see any performance difference). Went for a drive and after about a mile, the truck completely died on me as I came to a stop sign. I was able to get it started after a couple tries. A few blocks later, it did it again. I went home and adjusted it back to 500 (where it has been for the last year). Drove it again and the same thing happened. When I finally got it started, it smells like it is running really rich now. I have an HEI Distributor and Holley 670 Street Avenger carb with a small block 350/290. Not sure what it could be, possible float bowl issue?? Any advice would be appreciated.