98 Catera wont start after driving.... help

ok car starts in the morning no problem...then i park and cut off engine go back and it wont start ...if i leave it there for say 2-3 hours and if i dont drain the battery from trying to get it started. it starts again with no problem but if i leave it in idle without giving it gas it cuts off again and have to wait 2-3 hours again... why is it doing this?

i have clogged breather which im about to clean saw creamy paste in breather hose and oil cap ....non on dipstick