Lacrosse buick no start

Hi, Any thoughts as to what to look for here? 06 buick, ran fine, no start after sitting 2 weeks- checked - gas ok half tank - fuses OK, checked tham all.
- cranks fine, no hint of start or gas smell - for some reason now when letting go of key after cranking it still cranks for 2 seconds..(not sure if related) - ignition from key seems ok, lights etc..
Thanks for your time Tom
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anyone know the resistance specification for a 2006 buick lacross 3.8 spark plug wire?

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