I recently had a problem with bogging and loss of power under 3000rpm. I couldnt figure out what it was and then it started to happen at any rpm. Eventually when i was driving and reached 5000rpm, all of my vaccum hoses blew off. i knew there had to be a problem with too much back pressure. I checked my CAT and it was clogged. The ford dealership replaced all of my damaged parts because the CAT is still under warranty. You might want to look into this if the fuel pump is not the problem either.
