Engine shuts off when cold

I have seen the engine coolant sensor cause this issue. If the sensor value gets off it thinks the engine is hot all the time, here is the location of the sensor so you can change it out to see if it helps the problem. Also, I have included a guide to help you check for vacuum leaks.

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

Check out the diagrams (below). Let us know what happens and please upload pictures or videos of the problem.