so you check and there is no spark while cranking? Check you crank signal. Crank sensor, ignition module, ECM, and even fuel injectors can shut down an engine just like someone turned off the key while you're driving. Oh yeah, the ignition switch too. You have to check to see what you have and what you are missing when it cranks over and doesn't start again.
Here is one example:http://www.youtube.com/watch?v=41SZexc_ ... Y0wF2o5WUw