Mayt, I own a 94 GMC with the 6.5 turbo and wouldnt take anything for it. I have had some problems with it over the years but what your describing sounds to me like (from experience) your muffler and catalytic convertor are stopping up. At 300,000 miles i had to have mine removed and am running it now without either, just a straight pipe, and its very little louder than before. Once i discovered they were stopped up the diesel mechanic told me that gm had a lot of problems with this and stopped installing the catalytic convertor on their diesels after 95. Mine has more power now than when it was new. All ive done to it mechanically is to put ALL new berings in it and change the driver box on the injector pump a couple of times. I did buy a heat sink and install the driver box on top of the manifold so it (driver box) would run cooler. It now has almost 340,000 and is still running better than new. You will have to change the lift pump every couple of years but to me thats kinda like changing the fuel filters.
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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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