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I don't know that it's your problem, but by your description you have a PCV system that would be a shitty band-aid for a haggared turbo setup, that puts full intake vacuum on your crankcase - with no fucking turbo? Why do you have a catch can at all? You're probably pulling past all sorts of seals and stuff. A positive crankcase ventilation system doesn't put uber vacuum on your crankcase, it creates a positive flow and a mild vacuum, to pull fresh air into your engine to flush out the vapors.
It sounds like you've done plenty that will confuse the shit out of the stock computer, while managing to do absolutely nothing that would make the car faster.
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