The tank is American Standard Model #4112. In order for the toilet to flush, I have to completely hold down the handle until the toilet completely finishes flushing. If I release the handle early, the water stops going down. The tank fills fine, but slowly. Could this be a water pressure issue? It has a lot of trouble getting anything more than a few pieces of toilet paper down. Someone suggested getting a pressure-assisted toilet. I am fine buying a new toilet, but just wanted to make sure first that the problem isn't something that's fixable. I think the tank is just screwed.