I've got a toilet that is acting up. When you flush it, the water slowly rises to the top and then slowly goes down and leaves the bowl. The water doesn't move fast enough to remove solid waste. Also, the toilet is loud when flushing... like it is straining itself.
The tub and sink in the same bathroom let water down normally and do not bubble or anything. If I take a bucket of water and pour it into the toilet, it flushes normally. I took a coat hanger and bored out the bowl holes and the siphon jet, but they don't seem to be clogged.
Any ideas? The toilet could be original to the house (50 years old), so should I replace it with a new flushing one or anything?