The Toilet Is Bubbling And Doesn't Flush Strong.

You don't need a new toilet. You have a partial blockage on down the line. Let me explain. You flush or drain a fixture and the discharge runs down the drain, hits the partial clog and bounces back sending a bubble of air ahead of it. Then it drains away but not before it impedes the flush.
The solution is to snake the line out from the lavatory roof vent. Put out enough cable to get to the base of the vent and about 20 feet more. Good luck, Tom

The Toilet Is Bubbling And Doesn't Flush Strong.

You don't need a new toilet. You have a partial blockage on down the line. Let me explain. You flush or drain a fixture and the discharge runs down the drain, hits the partial clog and bounces back sending a bubble of air ahead of it. Then it drains away but not before it impedes the flush.
The solution is to snake the line out from the lavatory roof vent. Put out enough cable to get to the base of the vent and about 20 feet more. Good luck, Tom