Got an 09 RKC. 20,000 km, SEII slip-ons, Stage 1 air cleaner and a TFI. Noticed in the last few runs she seems to have an intermittent miss. Other than that she ran fine. Tonight after a 2hr run the engine seems to be missing more and seems to be down on power. I shut down for a coffee and when i fired it back up she was idling rough. On the drive home it was getting worse. Running poor and down on power. Checked for codes, there where none. Under warranty but i'm reluctant to go to the dealer because of the TFI. Any suggestions on a good place to start looking for a problem.