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Message: [QUOTE="bluedge8, post: 1411245, member: 132"] So I just wanted to start a thread to bounce ideas off of you guys. truck stats: f350 cclb 4x4 266k miles 4:10 gears 285/75/16's 3" down pipe to 4" full exh, no cat, has a flow through muffler 6637 air filter ts 6 pos chip, Dynoproven tunes custom remote fuel fitler and regulator, still has mechanical fuel pump 30' 5th wheel, 9800lbs pretty flat terrain. I have noticed it rough running here and there but I haven't had it loaded down since this spring and it ran fine then. So I hooked up the 5th wheel and headed for home about 100 miles. Started out on 2 lane 55mph roads, it accelerated fine up to about 35 mph ok then started to fall on it's face and had trouble maintaining 55mph and then it started to miss. I would back off for a little bit and then hammer down and it would run smooth for a little bit then start missing again. For the whole 100miles. Now, the first thing I am thinking is I either have an air leak in my fuel system. Or, I'm running out of fuel pressure. Another thought is that I'm running out of hp oil, but with stock sticks I don't think it's oil. I am going to buy a fuel pressure test kit tomorrow to see where the fuel pressure is at. I just bought a used reg return and I have an SD electric fuel pump, but I was planning on towing double on a 4 hr trip leaving this thursday, so time is limited on putting a fuel system in the truck by then. Any other thoughts on where to look? [/QUOTE]

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