weird starting issue

[1tonchevy]

I'm not sure how to even explain this issue as it's very weird.

most time my truck starts amazing for an old carbarated truck (even on cold days and not having the choked hooked up)

but some times it has a hard time starting and if it does start it spits and sputters and some times quit the only "cure" for it is to rev it till it "clears up" and then its fine....it's very weird and I would like to get it fixed so ppl don't stare at me when I start it up and have to rev it to get it to run right lol.