ANSWERS: 2
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Could be dirty injectors...?
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Have you had a tune up lately? My 2005 Freightliner with a CAT had an injector harness that had to be replaced because it did the same thing yours is doing. Use fuel cleaner once a week in the summer and twice or more in the winter to keep water OUT of the injectors. I just traded in a 1998 Freightliner with 1.6 million miles one it and it had the original injectors in it. I changed the fuel filters every 6,000 miles. Water KILLS injectors. Hope you get it figured out and hopefully it doesn't cost you and arm and a leg.
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