1999 Mazda MX5 NO SPARK, NO GAS

Electrical problem
1999 Mazda MX5 4 cyl Two Wheel Drive Manual

I have Miata in my bay and I'm having trouble with it. Cutomer complained that the car was runnig fine and after a short trip to the store, the car wouldn't turn on. I get it into the shop and start checking all obvious things, fuses, coil packs, haresses and connectors, even sensors. I have no fuel nor spark. My final thought is the ECU is fried but the part is too expensive to just buy. I tried to unplug sensors to purposely set off the check engine light, but no luck. It won't even do that, so the scan tool isn't helping. Is there any way to check the ECU without having to buy another one first? Or do you have any suggestions with my problem?

Thank You,
Kyle