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LQ4 starts shuts off

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We put a LQ4 into a 1957 chevy. Using stock computer and wiring, when we start it, it will only run for a couple seconds and shuts off. We've started it half a dozen times and it does the same thing each time. Anyone every experience this or have an idea what might be missing ? I'm using EFI live to tune it, I took the oil level and a few other things out of the tune that we are not using.

I got the same problem a couple months ago , Just check the ECU power wiring and Fuel Pump be sure the 12v power is good and dose not cut off when you starting the engine .

Did you Disabled the VATS ? " Vehicle Anti Theft System"