1998 Chevy Suburban Crank but No Start (Solved)

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I have a 1998 Chevrolet Suburban 1500
247k
5.7 Vortec Engine
It would start but die almost instantaneously
PROBLEM WAS SECURITY MODULE ON THE IGNITION KEY. THERE IS A CABLE CONNECTION THAT WAS LOOSE WHICH MAY HAVE DISPROGRAM THE SECURITY COMMUNICATION TO THE ENGINE COMPUTER. I HAD TO BYPASS THE SECURITY(disconnected green and brown cable as well)
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