1996 Olds Cutlass Supreme won't start

3.1 litre v-6. Car died when pulling into a parking lot. Plenty of gas in thee tank, the fuel energizes (though we can't verify the gas is getting to the injectors), do have spark at spark plugs. Engine still won't fire. I assume either a timing issue or possibly a shorted sensor that is drawing down the spark plug potential (weak spark). Would you have any ideas of the best way to troubleshoot from here? Many Thanks!