Diagnosing is the act of troubleshooting. A symptom can be troubleshot, a check engine light can be troubleshot.
The CEL was diagnosed (troubleshoot) and the cause was appearantly the module.
The module replacement appearantly repaired the reason for the CEL to light up.
Now you have a symptom of hesitation/lack of power. This is diagnosed or troubleshot as I said in my first post.
I hope that clears it up a little.
Wednesday, February 10th, 2010 AT 7:42 PM