i'm at my wits end and ready to call the plumber. our toilet flushes, but doesn't suck down right away. the water inside slowly goes down. ocassionally, a good full flush will go down and we hear gurrgling sounds in the sink and tub. we have plunged and snaked the toilet. we have pulled the toilet up and inspected from the bottom. we snaked the drain pipe in the floor when the toilet was up. i quickly poured a bucket of water down the drain in the floor and it went down quick and didn't clog. and finally today, i went up on the roof and checked the vent and it looks clear for as far as i can see. i don't know what's left to do. the toilet still does not flush properly. any ideas?