Replaced drain pump but still not draining.

Our Kenmore 80 series model 110.24232100 wasn't draining. We replaced the drain pump, and it worked great for the test run. Then it stopped draining again. So we took the machine apart again to see if we could find another issue. Well, we did find a clorox bleach cap covering the hole to the drain pump when we removed the entire tub. We thought for sure that was going to fix our problem. However, it has not. We can hear gurgling sounds coming from the black drain hose that goes into the wall as if it's trying to empty. However, it isn't. Any other suggestions? I really don't want to have to buy a new washing machine. TIA.