enrichener?vacuum?petcock?

[dwint51]

I had a fuel problem a month ago and brought it to a shop.he said he put a fuel valve in there and disconnected all my pollution.ran great for awhile but not it seems my idle is really low.if its warm it will start but if its cold you have to take the carb boot off and use your hand over the carb.once its warm I put the boot back on and its fine.runs great and have a brown plug.also if I take the fuel line off no gas comes out but if I blow and suck on the carb end and put it back on it will start