Edelbrock 1405 Carbs

I recently thought my engine had a vacuum leak, but I replaced everything to do with the vacuum, hoses gaskets etc.
After that my engine was still barely idleing, so I took my carburator off and stripped it all the way down and had everything cleaned, when I re-installed the carb and got all the lines connected I fired the engine up and it still was barely idleing, after I killed it to try something else I noticed a quiet air sound, it was either sucking or blowing air, but while I was trying to find the air I squeezed my gas line and when I let go it sounds like it was sucking the gas out of the carb or just sucking air or something.
After that I fired it up again and it ran fine for a few minutes and then went back to barely idling.
My question is, could it be flooding out, or could I have a loose gas line somewhere causing the bad idle, should I try adjusting my floats, if so how?

could be trash under the needle and seat. if your carb. is flooding and you think its trash under the needle and seat to clean it without pulling the top of the carb. off is to squeez the gas line closed until the carb. runs out of fuel, then when you crank it up again the new fuel rushing into the carb. will wash the trash off of the needle. fixed a lot of flooding carb. that way. if when you close the fuel line off and it runs better that tells you you could have a flooding carb. im not saying thats what it is im saying it might be. **)