Originally Posted by serendipity
It's more likely misfires, caused by the car running exceptionally rich. Did you double check the parameters that were used when you were tuned for CLF? Are you able to see your fuel trims with an OBDII scanner? Maybe the 0% column is so lean the car has high fuel trims, causing it to run really rich in the UTEC CLF areas.
Also, keep in mind the 25% (default) threshold for switching to OLF no longer applies - it falls back to the 60% (default) value in the Tuner Parameters screen. (Not that this sounds like it's related to your particular problem...)
it might possibly be running too rich. my AFRs are 9.99:1 right now @ around 5500-6000rpms. i hope this is the culprit, but then i've run 9.8:1 before in OLF while tuning the car and my plugs never misfired. i'll try to get it down to 10.XX:1 and see where that takes me. (fingers crossed)