I kind of have the same problem, I have a 97 gmc 1500, my check engine light came on, and my trans won't shift automatically, I unhooked the battery trying to reset the computer, it did, and my trans started shifting again, but then the darn light came on again, my speedo and tack aren't working as well, I am taking it to a shop tommorow to see what the code is and have it erased from the computer, I hope to heck its nothing serious, I just bought the truck on april 2nd
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