no spark?

Hello,

Many of these GM cars have issues with the ignition control module (ICM). By having a faulty module you will get no spark to the plugs.
The ICM is located under the three igniting coils. The coils mounts on the ICM.
First you want to check to see if you are getting power to the Ignition Control Module.
You should be able to use a voltmeter to verify that.

https://www.2carpros.com/articles/how-to-use-a-voltmeter

If you are getting power then the issue would be either the ICM or coils.

Here is a video showing how to test coils:

https://youtu.be/1zQQy9noYQ0

Most auto parts stores have the capabilities to test the ICM. All you have to do is take it off and take it to them.

I have attached the replacement instructions of the ICM for your reference.

Please let me know of any questions.

Thank you.