'06 Aveo cranks, but won't start. Running out of options

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This is the list of troubles I had with my 06 over the years
1) Oil leakage from the valve cover into the spark plug holes
2) Check timing. Is the timing belt in good shape and does the marks line when the Cylinder #1 is TDC?
3) A Good solid energy source (electric). Is the battery in good shape? Are the ground wires connected properly? The 06 you can put a spark tester inline with the plugs.