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horseboy 06-01-2009, 08:43 AM I been getting a surging and stumble at highway speeds and when towing it seems like i'm running out of fuel. I've changed the fuel filter and it still does it.I had injectors replaced at 100,000 miles and FPR at 170,000 miles. I had injectors checked recently and all are within limits. scramHD 06-01-2009, 11:09 PM either your fuel supply is weak, or your turbo is showing age. There is a mod for the turbo intake. This helps with the surge. For the fuel, install a lift pump. Did you check for DTC's? Can you check rail pressure? Have you checked your intake for looseness or leaks? Cleaned MAF sensor? chevyman33 06-02-2009, 12:51 AM fuel pressure regulator valve? | ||