Can one test coil packs?

The best way to test a coil is its output which you can do while it is in the car. Use a test light and follow this video:

https://youtu.be/baq_aEWNQ0Y?si=EdOtoGHYP9CwjWLk

You can check the coil OHM's reading with a voltmeter but that can change while the coil is being used. Check the coil's resistance by placing the multimeter's leads on the coil's primary and secondary terminals.

This guide can help as well:

https://www.2carpros.com/articles/how-to-test-an-ignition-system

Here is how to replace the ignition coils correctly in case you need them. Check out the images (below). Please let us know what happens.