Our toilet is flushing very slowly. When it is flushed tiny bubbles come up from the hole and sometimes it almost fills to the top before draining. It also doesn't have enough suction at times to suck down the toilet paper. When the water does drain out it sounds like a slow gurgling sound. We have plunged it and used a snake which seems to fix it but then after a couple if (not as slow... but not normal) flushes it starts all over again. Please help! Thanks.

Air bubbles occur when a partial blockage produces a backflow consisting of a bubble of sewer gas, You can use an Augar see the image below. If that would not help you can snake from the lavatory roof vent or remove the toilet and use a snkae, good luck

I have one that most repair plumbers miss.. Look down at the bottom of the bowl. If there is a small hole, then that is a jet that starts the syphon action. If it's clogged the water will just swirl around and slowly go down leaving solids behind. Take your finger,(UGH! ) and run it around the inside of the opening. Over the years minerals build up and cut down on the syphon (flush) action. If it is rough or you feel build up, take a table knife and put a bend in it to get around the curve in the bowl and chip and scrap it clear. Next take a coathanger and clear out the holes around the rim. They start the swirling action. And last, check the water level in the tank. It should be 1/2" below the top of the over flow tube. And speaking of the overflow tube, Make sure the small 1/8" tube from the ballcock to the white overflow tube is connected so it discharges in it and that it's flowing when the ballcock fills. This is what raises the water level in the bowl. For a good solid flush they all have to work together. Hope this helps and thank you for rating my reply.. Tom