99 GMC SUBURBAN 5.7L Vortec start and die, continuation.

What is your question?

5.7l Vortec. Starts, runs for about 1-3 seconds, and dies. Then starts and stalls again. Won't stay running. 60psi fuel pressure. No codes. No lights. No security lights, Ever. All fuses test good. Will run on spray brake clean till it runs out. Does have a fuel pressure leak down. Happened suddenly, when went to leave store. Prior to parking had gone over a rough road. Wiggle test on harness = no change. Primary transportation, any help appreciated.

How long has your 1999 GMC C1500 Suburban had this problem?

3 days