i have a 74 blazer with a 2 yr old 350crate, and a 4brl holley carb. and the other day i was drivin along with no problems when at a stop light i noticed the car was idleing unevenly and smoking a little, about 10 miles down the road i let of the gas and the car cut off. It would absoloutely not start again unless i had it floored and even then it smoked something awful and ran like [censored] and unless i was giving it gas it would cut off again. however if i left it alone for about an hour it would start up just fine again but 10 miles down the road it would die again and do the same thing. HELP!!!! i think its got something to do with the carb. IF ANYONE HAS ANY ADVICE ITS MUCH NEEDED.!!!!!!!!