Engine acts like it is going to quit running?

If the engine is misfiring it should have a code lets run the computer to see if any are stored, this guide can help:

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Also, please go over this guide to help see what's going on:

https://www.2carpros.com/articles/engine-misfires-or-runs-rough

It sounds like you may have a fuel injector going out. Once we run the codes it should tell us which cylinder is having an issue so we can go from there, the fact it does not have the problem continuously is posting to something electronic which is good. Here is how to test a fuel injector and i have included instructions on how to swap out the injectors as well in the images below.

https://www.2carpros.com/articles/how-to-test-a-fuel-injector

Check out the images (below). Please upload videos in your response to the problem so we can see what's going on.

Let's remove the #2 and #4 spark plug to see what they look like. Also, let's do a compression test. This guide will help:

https://www.2carpros.com/articles/how-to-test-engine-compression

Do you notice the coolant level going down slowly? You may have a blown head gasket. If the spark plugs are very light colored, I would say the fuel injector can be causing this.