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  1. R

    Poor Preformance all at once on long haul

    Thanks for the help! I changed the fuel and air filters, and it took care of the problem. Truck ran great on the way home. Just want to say thanks for your thoughts and quick responses. Thanks You!
  2. R

    Poor Preformance all at once on long haul

    no fuel in oil that I can tell
  3. R

    Poor Preformance all at once on long haul

    I changed fuel filter last year, or 10,000 miles ago. No lights, codes not known, All gauges in normal range.
  4. R

    Poor Preformance all at once on long haul

    I just drove from Colorado to Missouri with a full load of horses. 2003 Duramax 6.6. with 120,000. On the drive the truck started to shift hard, loss of power, dropping fuel mileage, and much more engine noise. I just changed the oil to Valvoline Full synthetic 5W40 could that be the cause...
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