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Watch it run in the dark and maybe you'll see a spark jumping off a cylinder somewhere. It could be running on 7 cylinders if something like a spark plug was damaged or cracked during installation. Recheck all your wire connections, it sounds similar to the problem I was just having with my SS. If the coolant sensor is sending bad information the computer will really struggle to keep it running. Maybe a bad ground somehwhere as well. Did you reconnect all the ground straps?
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69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
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