running problem

[GREASEMONKEY72]

sometimes my truck will try to die on me, itll be idleing fine then for some reason the rpms will start to drop slowly and eventually die if i dont keep it runing myself, now this happens fully warmed up or not, i never know when its gona do it till it does it and if it matters i did let it go to see if it would die and i took the aircleaner off and when it died some fuel splattered out of the carb, thats how i know itll die, i have to 2 foot it to keep it going in gear or not and it really sucks in the middle of traffic

any help is greatly appreciated and thanks in advance