Well I'm going to assume it actually cranking and what is cranking check that battery voltage if it drops below 9.4 volts does not give enough power to the ECM so the spark plugs will let him know to fire first and if it is turning over you want to make sure you are getting spark to the plugs to check that make sure you do grown the plug while you are watching for spark because if you do not ground the plug it causes electronic problems it needs to dump that charge and of course check your main fuse your fuel injection fuse which I believe its the 4th one down on the left hand side if it is fuel injected if its not check for gas in the bowl there's quite a few things to check just eliminate one at a time hey and see if there's any codes you can pull that up even if the motor is not running and then Google that number that you pulled up and it will aim you at the problem,,,,, good luck ,,,,