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Obviously no-one knows for sure what the problem is... Changing oil seemed to help me. but to tell you the truth, its not like thats the only thing i've done differently: I only use shell gas, I clean the throttle body every 6k and do the re-learn, K&N filter is clean, I use a bottle of fuel injector cleaner when I remember to and I took off the HFC's even though that shouldn't mattter. I think in reality, its probably a combination of things that cleared it.
