MBA Gasoline Concobomba Problem

I have a Hyundai Accent 2000. Yesterday I changed the pump and gasoline filter because when the engine was running, even in idiom also on some occasions. The issue is that this new bomb makes a noise like a snoring, which the previous one did not do. On the other hand, today I noticed that at a certain moment in idle the resolutions went down almost until the engine turned off but does not go out. I accelerated it and after that is normalized

That pump will not last.