fuel issue after car sits.

i am really starting to think mine is boiling in the carb. the other day i want to spray out the carb after driving it and when i opened the throttle a big cloud of boiling steamy gas came out of the intake. i checked the heat riser in the manifold and it was froze again. every time i drive the car i soak it in pb blaster but it seems like once it burns the pentrant up, it freezes up again. i really wantot just take it out. i think its doing more harm than good.