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98 gmc c5500 v8 350 questions

Discussion in 'Medium-duty Truck Forum' started by wtree, Nov 14, 2013.

  1. wtree

    wtree New Member

    Hi all, I need some advice please, local mechanics are not helping me out here, nor is the dealer. I have a chip dump, losing power and sputtering in the morning especially. Over the weekend after sitting it's even worse.
    The check engine light flashes here and there and I get a dinging signal...the mechanics find they are unable to read the codes from the computer...but cannot say why!
    What do I do? Ideas on why codes cannot be read? And how to fix and make sure I'm not hurting my truck even more.
    I gave a tune up about 3000 miles ago and it is running very rough and seeming gutless.
  2. BurbanMan

    BurbanMan Member 1 Year 500 Posts

    does it have an obd ii port as the smaller trucks do?

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