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 - Old Time Threshing - by Anthony West. A lovely harvest evening late September 1947, I was a school boy, like all school boys I loved harvest time. The golden corn ripens well and early, the stoking, stacking,.... the drawing in with the tractors and trailers and a few buck rakes thrown in, and possibly a heavy horse. It would be a great day for the collies and the terrier dogs, rats and mice would be at the bottom of the stacks so the dogs, would have a busy time hunting and killing, all the corn was gathered and ricked in what we c
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