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2004 Caprice, so it is a WK Caprice (VY Commodore model range)?
Sounds like a no-spark or no fuel condition.
Can you remove 2 spark plug leads from one coil pair at the coil, like 6 & 3, then crank the engine, to see if sparks jump across the coil towers?
How have you gone with your no-start condition?
Have you tried as I suggested above?
All the best Michael.