hay fellas i have a slight issue.i have a 350 with a eddy carb that i just rebuilt and replaced intake gasket.The problem is that while i was observing the engine run it seems to idle up and down on its own.Sometime is takes a few for the change.It has a pretty hot cam in it so i usuallt idle it around 1100 rpms.i had it set at 1500 and it will drop down to about 950 then surge back up again.it will keep doing this over and over.when put in gear the rpm drops pretty low then stalls.kinda weird to me but heck i dunno.does this seem more like an intake manifold leak or carb problems?ill take any suggestions before i rip it all apart again.

ps the flots are set at approx 7/16 and approx 15/16.has good fuel pressure.