An engine needs 3 things to run: Spark, Fuel, and Air. First off I'd start wit the spark plugs, their color and condition may help you trace the problem but I would replace them regardless. Also check if you are getting spark, as well as your battery condition.
bsinit wrote: Afterward it wouldnt crank
But if the engine wont turn over altogether and your cranking power is fine, it may be something more extensive and internal. Hope I helped a little