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So, in my latest quest to diagnose idle issues (I have tried everything - boost leak testing, changing MAFs, ECUs, switching back to recircs from BOVs, on and on), I recently replaced the O2 sensors with 2 known good ones. The car still doesn't idle well (really low when cold, and almost wants to stall). Again, if I leave them off when cold, the car idles fine. Once warm, it does idle somewhat ok, with and without the O2s plugged in. Now, here is where it gets weird. The RPMs vary a little bit. It will sit a little low for 20 seconds around 600-650ish, but then go back up to about 750-800 RPM and hover there for another 20 seconds and then repeat. During this transition, I can hear the PCV valves rattling. Could it be that my idle issues are related to PCV valves going bad?
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