I'm dealing with something similar. CEL/ECG. Scan showed misfire on 1 and 3. Plugs had less than 1,000 miles. So I changed the coils on 1 and 3. Cleared codes and rescanned. Misfire on 3. Took it to inde' mechanic, who said low or no compression on 3. I'm getting it flashed from Stage 1 back to stock today and removing the CAI for my trip to the dealer. I still have about 11K miles left on my powertrain warranty. So I figure if it's a valve job, it will be covered.



