I need some more experienced advice here before this gets ugly and expensive. I have an '03 6.0l with 94k on it. I put an Extreme tune from Eric on it 5K ago, changed iol and fuel filters 3K ago. Runs Great. A week ago I'm at a light and it starts a stumbling idle, varying about 300RPM, then it was rough on acceleration from the light (almost like it was dropping a cylinder off and on). Then it stopped, I couldn't duplicate it. It has since done this 3 more times with no common factors I can come up with. I was beginning to get worried about injectors and other things till today. I hit the key for the plugs and heard the fuel pump varying. 3 times I did it and sometimes it was weak sounding, then strong, etc... almost sounds like its got a loose connection and sometimes not getting full voltage. I'm no genius, and I'm not real familiar with the 6.0L yet, but does this sound like a fuel pump going bad? I drive alot of desolate roads each week and would REALLY not like it to die out there! Any help to save me time and money would be greatly appreciated!