Engine behaves like it is going to shut off?

Hi,

Which gauges are all over the place? Also, if the battery is still connected, the alternator itself won't shut off the vehicle.

As far as a stalling issue, most often it is caused by an engine vacuum leak. If you haven't checked for that, start there.

Here is a link explaining how it's done:

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

Also, if the check engine light is staying on, we need to have the computer scanned to identify what trouble codes are stored.

Here is a quick video showing how it's done:

https://youtu.be/b2IJGfImVvw

Let me know what you find or if you have questions. Also, let me know what size engine the vehicle has.

Take care,

Joe