GMC Troubleshooting Questions? Ask a Mechanic for Answers
Hi, I am Mike, welcome. I'm reviewing your question.
Ok, a few things here. A 1500 is not a 3/4 ton, it's a 1/2 ton, the 3/4 ton is the 2500. Second, what did that 857 mean, was that supposed to be a code? If so, you are missing 2 digits most likely a P and maybe an 0, was it a P0857? Last, have you changed the fuel filter yet? If not, do that next.
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