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Interesting that there are no codes. Not even history codes?

How did you determine that?

Does the Check Engine Light flash while driving?

If there are in fact no codes, typically a fuel problem is the cause.  Check fuel pressure, check the fuel pressure regulator.  

How does it accelerate when pushed hard?

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >>

How to check for codes Caddyinfo How To Technical Archive >>

Cadillac History & Specifications Year by Year

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Which 3 coils and why those 3?

You really need a scan tool that can display misfires. Most cheap scan tools will not. 

Without being able to see which are just guessing. 

Attached is pic of a GM Tech 2 displaying the misfire graph. 

Wifes Traverse just needed 2 coils on Sunday when she got home from out-of-town.....very clear to see on the Tech 2....2 cylinders with multiple misfires under coil was noticeably worse than the other. To my surprise....took forever for the SES lamp to finally show a misfire code. (picture is old photo I have...not of the Traverse coils).

tech2 graph.jpg

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