Not cranking

Have a helper crank it, while you visually check for spark at the plugs. If you have spark everywhere, use a gage and check fuel pressure. Some of the national brand autostores used to loan out a fuel pressure gage.

To check for spark at the plugs, you pull a spark plug wire loose, use known good spark plug or spark tester in the boot. Ground metal part of tester to metal part of engine, engine cranking, watch for spark. How long since a tune-up?

Did you visually check for spark at the plugs. New plugs doesn't mean there is spark. Did you check fuel pressure, what is the fuel pressure spec?