I put a JT 3" exhaust (turbo back) and stage 3 ECU remap at the same time and I am having a tough time isolating the problem. The car runs really well but I cant seem to shake this CEL issue. The tuner send me another ECU with some tweaks that he thought would address the issue but it didnt work. I have 56k original miles on the car... could it legitimately be a bad purge valve? Anything I should try before buying parts? any input/help is appreciated, thanks!