Alright I got my new rebuilt CT-26 back from Arizona Turbo (which I have to say I am very impressed) anyways I shimmed it out to 9 psi now Im getting a lean condition on occasion not all the time but occasionally, and sometimes it runs perfectly. Im thinking its my O2 sensor starting to go bad, It does make the mixture gauge cycle quite a bit during idle and constant throttle operation. Anyone have any other ideas or suggestions, oh and I was running 6 psi before and the rebuild was a stock rebuild.