Rough Idle from Misfire? Check Engine Light but no codes? Help Please!!

[RoyaltySS]

I have a 2010 Camaro SS with a "stage 2" texas speed cam, long tube headers, CAI, high flow secondary cats.

A few weeks ago the check engine light came on flashing but went away by the time I could pull over so I let it be and forgot about it. Well it came back worse and won't go off now. Over the weekend I changed the plugs, wires, cleaned the air filter and MAF sensor, and ran injector cleaner through the system. While changing the plugs I found one of them was black like it wasn't firing, so I changed that coil pack.

Well, now it runs worse than it did before. I switched the plugs from NGK V-powers to NGK G-powers and the wires from MSD to ACDelco (OEM) wires, but those are the only two differences between what it had before. I tried switching back to the MSD wires as those are solid core versus the ACDelcos that are not, but that did not help.

The part that's confusing me is that the ECU is not throwing any codes to my reader so I am not sure where to go from here. Im going to pull the plugs back out after work and see if any of them are fouled after trying to run it but I am wondering if anyone has had this problem or if anyone has any ideas how to fix it!

Thanks!

[gtstorey]

Log and tune needed. And this isn't really "off topic". You should post in the GM v8 GEN4 section.