Wont start

With intermittent issues, you have to test when problem is ongoing. If it cranks good but won't start when the problem occures, have a helper crank it, while you check for spark at the plugs. If you have spark everywhere, use a gage and check fuel pressure. Don't even think about the fuel pump without checking fuel pressure. If your going to work on your own vehicle, a fuel pressure gage is a must.