For the last few weeks my 2000se with 78k practically stalls out when I pull out in the morning. In 3rd. and 5th. I hear a low pitched drone when I stomp on it, as if there is a lazy cylinder. I changed the air filter, fuel filter, plugs/wires, ran gumout injector cleaner. I'm using 10w40 oil. Oh, and I had moosing problems this past winter. Any ideas?