[Overlander23]

The car idles fine... I checked the exhaust system for leaks (Stage 2). I've got signs of soot at the 180 bend before the tips (the bend in the left side well). That's after the O2 sensor, though. It shouldn't cause a problem?

Car idles well, but if cold, when I very lightly tap the accelerator revs will dip and hunt in a cyclical fashion for a couple of seconds. Kind of strange, but I guess this is the ECU making adjustments up and down, hunting for the right O2 voltage.

Also wondering if it's related... when cruising at 2500 rpm, if I trounce the accelerator there's a pause before acceleration... sometimes a second or so. Like lag. Or like an accelerator pump on a carbed engine isn't quite working. This behavior does not manifest itself from rest. Full on acceleration from a stop is smooth and consistent. It's just that state change between cruising and full acceleration that suffers sometimes.