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I have a 97 with the 5.7 vortec with 245 thousand miles. Recently I parked it for a day and came back and it wouldn't start. Cranks but no start. Changed the fuel filter, which the old one had sand in it. Still wouldn't start. Pulled off the connection on the ignition coil and put it back on...

Could be the timing or even the new parts you put in. I was always told to use ac delco or gm parts because the vortecs don't like certain brands. When I got the same code I put ac delco plugs in and fixed the timing then it ran like a dream and I had no codes