I had the same thing happen. If you just replace the air cleaner it will still keep happening. One of you pulse air tube check valve is staying open. It is letting in water from the exhaust. One of the holes in the air cleaner should look rustier then the other. Follow the tube down the left side of the engine and there should be a silver check valve with a vacuum line to it. Make sure it is getting vacuum. But most likely it is rusted open.