I recently replaced the flapper on the toilet and it worked fine. I now find that the toilet bowl empties only every other time or you need to hold the handle down for a longer period for the toilet bowl to empty. The tank itself empties properly. The water swirls but never completely empties. What do I need to do since it works fine - but only every other time?
Thanks for the help.

Relax the flapper chain. The chain needs to pull the flapper fully open initially. The water will hold it open and it should slowly float back into place. The handle should not be intimately tied to the flapper.

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 . Tom