Car keeps shutting off no check engine light

Hello,

This sounds like the issue is a faulty crankshaft position sensor. A failing crank sensor can trigger the engine to shut down.
Over time all the heat and vibration from the engine and cause the crank sensor to lose calibration. This will make the sensor send error code to the ECM. Which can trigger the engine to shut down. It can happen at any random times.

The crankshaft position sensor mounts to the engine block below the generator, just above the oil filter.

Here are couple of helpful articles:

https://www.2carpros.com/articles/symptoms-of-a-bad-crankshaft-sensor
https://www.2carpros.com/articles/crankshaft-angle-sensor-replacement

I have attached diagrams for your reference.

Please let me know if you have any questions.
Thank you.