Are the plugs and wires good? How about the cap & rotor? What is the gap on the plugs? This efi stuff works so well, we tend to forget they need plugs and wires (and a cap & rotor) sometimes.

The next thing that comes to mind is, water in the gas? If the gas don't burn, it won't run. If it has spark and doesn't run, (we are assuming it has spark while cranking) its not likely to be anything EFI related. Gene