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Yes all sorted. Somehow the air tube going into the ICV was getting stuck intermittently. When this happens, afr goes super rich and the car misfires and throws a code. Dismantling and re assembling everything seems to have fixed it.
After that was taken care of, I still felt the car hiccup/shudder intermittently but no misfire codes. I suspected it was the O2 sensors (still on the original units). Changing those out fixed the issue. Car runs smooth as a baby's backside now.
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