Mazda Miata engine turns over but won't start

Check for proper spark , fuel pressure , injector pulse . Do you hear the fuel pump prime the system when you hit the key ?

There are a hundred reasons why an engine won't start. Do diagnostics and track down the problem. Or have a real mechanic who can actually see the car fix it for you. In the meantime, maybe it's low battery or dirty cable connections, or a blown fuse.