chevy 350 problems

[haplis]

so here is the problem, recently replaced the intake manifold. everything went smoothly. go to fire her up and she wont start. timing right,i advance- so throw a little gas down her throat and bingo she fires, running rough but running. so i adjust the timing and she s running great. turn her off and call it a night. go out the next day and now she wont start unless i pour gas into the carb. i checked the fuel lines and filter, there is spark. i even advanced the timing just to see if that would help. still only fires if i pour gas into the carb. i should also say that once i get her to run i have to lightly press on the gas pedal to keep her running. anyone have any ideas, im at a total loss. also im wondering if it might have to do with the idle adjustment on the carb. edelbrock performer 650 cfm