I have a 1994 Centurian turbo 7.3 IDI. It sat for about a year or so before I got it. It has 102,000 miles on it, and I just got it about a month ago. I have put about 2000 miles on it, and the first 1500 had no issues what so ever other than a little bit of water in the bottom of the fuel filter twice (I check it all the time to make sure). I replaced the fuel filter right after I got it once I saw that there was a decent amount of water in the separator and I had no idea when it had been replaced last. I replaced it a second time when the fuel filter light in the dash came on. I drove the truck with no issues and towed with it all over the place, no issues. Then as we are going to get our Christmas tree, as we start going up hills, it starts sputtering every hill we hit, with the fuel filter light coming on, then going off when we go down the hills...and clearing up. We made it home and the truck seemed okay, so I went to drive it the next day and I go to drive it home from a job and it just stopped running. It seemed like it ran out of fuel, so I went got fuel and put it in and it seemed to start okay so I started home. I got to the first hill and it died, restarted it and drove the rest of the way up the hill, and drove all the way to the next hill, and so on, until I hit a hill and it did not start again. I had to have it towed because it just would not start. I changed the filter again, got it started but on the very first hill, it stalled. I got it started, and got it home, but I am afraid to drive the thing until I know what is going on. Sorry this is so long winded, I just wanted to be thorough.