long story short, i was driving my truck in the snow today. ran flawless! i was leaving the woods and had to work the engine pretty hard getting out of the field. when i got to the bottom of the field, i noticed the truck was stalling (much like running out of gas which i've done since the guage is way off.) shut it down thought maybe it was hot. started it back up no dice. ran fine with 1/4-1/2 choke. drove to get some gas, filled it. no change. runs awesome down the road once i get passed 1/2 throttle or so. from searching seems like it could be an air leak or lean idle. i'm puzzled by how fast it happened, almost immediately while i was driving. my truck has the holley carb... i found a needle screw with a spring and seal that is down low on the carb, near the back on the side, facing the valve cover. took it out, prayed cleaner in the hole etc. put it back in, screwed it way out, virtually no change in idle. i'm not sure if it is in fact the idle screw or not, maybe someone can confirm. any way, sorry for the scrambled post, i'm in a huge rush right now though. any ideas on what to try next? i've only worked with carbs on small engines but i can learn pretty quickly.
Thanks!