380 se wont start

[earl orchard]

Hi all
could someone tell me were to find a diagnostic for a 380 that wont start? my 126 was running awesome and when i went to start it this morning it just cranked over with out starting. this engine would only need the slightest bump from the starter to get running, then all the sudden no start. i couldn't find anything in the service manual and didn't want to just start stabbing in the dark

thanks

kenny