GMC sierra 2500hd 04 died when stopped after engine surge and check engine light

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Truck had a surge at 1100 rpm for a while, then the check engine light came on. I drove it like three times since...the last time I was stopped at a light when my truck just died right there...no warning no bad noises or idles. It hasn't started since...got code P0673 when I scanned it...but I didn't think glow plugs would cause my truck to die and not start again! I replaced both batteries, the fuel filter and the fuel water seporator.....PLEASE HELP I'M A GIRL! LOL