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Did you see my questions to this in the other thread you posted about this issue?
Does this happen when the car is undergoing a regen? Does it happen when the car is still warming up (coolant temp not up to the 190-210 normal operating range)? Does it only happen in cold weather?
I've noticed this same behavior on two occasions when stopped at stoplights. The conditions I noticed were that it was cold outside (morning) and the car wasn't warmed up yet (coolant temps weren't near the normal operating range). Once warmed up on the same drives the idle went back to smooth and consistent.
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